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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table summarizes the changes in the balances of each component of accumulated other comprehensive income (loss), net of tax, as of December 31, 2020 and 2019:
| Accumulated Other Comprehensive Income (Loss)
| Unrealized Gains (Losses) on Securities Available for Sale |  |  |  | Unrealized Gains (Losses) on Cash Flow Hedges |  | Unrealized Gains (Losses) on Defined Benefit Plans |  | Total
Balance at December 31, 2019 | $ | 38,872 |  |  |  |  | $ | (1,141) |  |  | $ | (9,857) |  |  | $ | 27,874 |
Other comprehensive income before reclassifications | 58,513 |  |  |  |  | (1,169) |  |  | (1,767) |  |  | 55,577 |
Amounts reclassified from accumulated other comprehensive income | (9,397) |  |  |  |  | 716 |  |  | 66 |  |  | (8,615) |
Period change | 49,116 |  |  |  |  | (453) |  |  | (1,701) |  |  | 46,962 |
Balance at December 31, 2020 | $ | 87,988 |  |  |  |  | $ | (1,594) |  |  | $ | (11,558) |  |  | $ | 74,836 |
Balance at December 31, 2018 | $ | (6,343) |  |  |  |  | $ | (559) |  |  | $ | (14,520) |  |  | $ | (21,422) |
Other comprehensive income before reclassifications | 48,703 |  |  |  |  | (846) |  |  | 4,579 |  |  | 52,436 |
Amounts reclassified from accumulated other comprehensive income | (3,488) |  |  |  |  | 264 |  |  | 84 |  |  | (3,140) |
Period change | 45,215 |  |  |  |  | (582) |  |  | 4,663 |  |  | 49,296 |
Balance at December 31, 2019 | $ | 38,872 |  |  |  |  | $ | (1,141) |  |  | $ | (9,857) |  |  | $ | 27,874 |
Reclassification out of Accumulated Other Comprehensive Income (Loss) | The following table presents the reclassification adjustments out of accumulated other comprehensive income (loss) that were included in net income in the Consolidated Statements of Income for the years ended December 31, 2020, 2019 and 2018:
| Amount Reclassified from Accumulated Other Comprehensive Income (Loss) For the Year Ended December 31, |  |
Details about Accumulated Other Comprehensive Income (Loss) Components | 2020 |  | 2019 |  | 2018 |  | Affected Line Item in the Statements of Income
Unrealized gains (losses) on available for sale securities (1) |  |  |  |  |  |  |
Realized securities gains reclassified into income | $ | 11,895 |  |  | $ | 4,415 |  |  | $ | 4,269 |  |  | Other income - net realized gains on sales of available for sale securities
Related income tax expense | (2,498) |  |  | (927) |  |  | (896) |  |  | Income tax expense
| $ | 9,397 |  |  | $ | 3,488 |  |  | $ | 3,373 |  |  |
Unrealized gains (losses) on cash flow hedges (2) |  |  |  |  |  |  |
Interest rate contracts | $ | (906) |  |  | $ | (334) |  |  | $ | (470) |  |  | Interest expense - subordinated debentures and term loans
Related income tax benefit | 190 |  |  | 70 |  |  | 99 |  |  | Income tax expense
| $ | (716) |  |  | $ | (264) |  |  | $ | (371) |  |  |
Unrealized gains (losses) on defined benefit plans |  |  |  |  |  |  |
Amortization of net loss and prior service costs | $ | (84) |  |  | $ | (106) |  |  | $ | 20 |  |  | Other expenses - salaries and employee benefits
Related income tax benefit (expense) | 18 |  |  | 22 |  |  | (4) |  |  | Income tax expense
| $ | (66) |  |  | $ | (84) |  |  | $ | 16 |  |  |
Total reclassifications for the period, net of tax | $ | 8,615 |  |  | $ | 3,140 |  |  | 3,018 |  |  |
(1) For additional detail related to unrealized gains (losses) on available for sale securities and related amounts reclassified from accumulated other comprehensive income see NOTE 4. INVESTMENT SECURITIES. (2) For additional detail related to unrealized gains (losses) on cash flow hedges and related amounts reclassified from accumulated other comprehensive income see NOTE 14. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES.

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