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Certain reclassifications of prior period amounts have been made to conform to current classifications, as noted below. In August 2018, the SEC issued a final rule that amends certain of its disclosure requirements. The rule extends to interim periods the annual disclosure requirement of presenting changes in shareholders' equity; in addition, an analysis of changes in shareholders' equity will now be required for the current and comparative year-to-date interim periods. The final rule is effective 30 days after its publication in the Federal Register, which occurred on October 4, 2018. As such, for our third quarter filing, the Company has updated our Condensed Consolidated Statements of Changes in Shareholders' Equity to present the interim periods.

Subsequent to the issuance of the Company's June 30, 2018 condensed consolidated financial statements, the Company's management determined that a prospective interest method was incorrectly used to recognize income on the portfolio of residential mortgage-backed securities and collateralized mortgage obligations which had a fair value of $2.5 billion as of June 30, 2018. These securities are considered structured note securities as defined by ASC 320-10-35. Income on these securities should be recognized using the retrospective interest method. The Company has historically used the prospective method of income recognition for these securities. For other types of securities, there are other methods of income recognition allowed by the guidance. To reflect the change, management continued to further refine the estimate and an updated cumulative difference between these two methods of $7.0 million was recognized as an out of period adjustment in the three months ended September 30, 2018, resulting in an increase in interest income on taxable investment securities and a corresponding increase in the unrealized loss on taxable investment securities. An overall updated cumulative difference between these two methods of $169,000 was recognized as an out of period adjustment in the nine months ended September 30, 2018, resulting in a decrease in interest income on taxable investment securities and a corresponding decrease in the unrealized loss on taxable investment securities. We have concluded that this error has an immaterial impact to the results for 2018, as well as prior periods. The Company recorded the adjustments in the quarters ended June 30, 2018 (as previously disclosed) and September 30, 2018. No other periods have been updated to reflect these adjustments.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement. The ASU was issued to improve the effectiveness of disclosures surrounding fair value measurements. The ASU removes numerous disclosures from Topic 820 including; transfers between level 1 and 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation process for level 3 fair value measurements. The ASU also modified and added disclosure requirements in regards to changes in unrealized gains and losses included in other comprehensive income, as well as the range and weighted average of unobservable inputs for level 3 fair value measurements. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. The guidance is not expected to have a significant impact on the Company's consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract (A Consensus of the FASB Emerging Issues Task Force). The ASU reduces complexity for the accounting for costs of implementing a cloud computing service arrangement. The ASU aligns the requirements for capitalization of implementation costs incurred in a hosting arrangement that is a service contract with those incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The ASU requires an entity in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. Costs to develop or obtain internal use software that cannot be capitalized under subtopic 350-40, such as training costs and certain data conversion costs, also cannot be capitalized for a hosting arrangement that is a service contract. The capitalized costs will be amortized over the life of the service contract. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. The Company is currently evaluating the impact of this ASU on the Company's consolidated financial statements.

For the three and nine months ended September 30, 2018, net earnings available to common shareholders were $91.0 million, or $0.41 per diluted common share and $235.9 million, or $1.07 per diluted common share, respectively, as compared to net earnings available to common shareholders of $63.8 million, or $0.29 per diluted common share, and $167.0 million or $0.76 per diluted common share, for the three and nine months ended September 30, 2017, respectively.
The increase in net earnings for the three months ended September 30, 2018 compared to the same period of the prior year was attributable to an increase in net interest income, a decrease in non-interest expense and lower income tax expense, offset by a decrease in non-interest income. The increase in net interest income was driven primarily by higher average yields on interest-earning assets, specifically within the loan and lease portfolio and taxable investments, offset by a higher cost of funds. The increase on the yield of taxable investments was due to changes in accounting methodology to the interest method for residential mortgage-backed securities and collateralized mortgage obligations. The decrease in non-interest income relates to the decrease in the gain on loan sales due to fewer portfolio loan sales in the quarter, as well as a decrease in residential mortgage banking revenue. The decrease in non-interest expense was driven by lower salaries and benefits expense, resulting from the Company's organizational simplification and design phase of the operational excellence initiatives, offset by higher consulting fees to help identify and implement organizational simplification and efficiencies, including procurement, occupancy optimization, and providing a more efficient customer experience. In addition, there were no merger-related expenses in the period compared to $6.7 million of merger-related expenses in the three-months ended September 30, 2017. The decrease in the provision for income taxes was due to the Tax Cuts and Jobs Act (the "Tax Act") passed in December 2017, resulting in an effective tax rate of 25.9% for the three months ended September 30, 2018, as compared to an effective tax rate of 35.9% for the three months ended September 30, 2017.