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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) |
Schedule of components of accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Unrealized Gains |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | and (Losses) | ​ | Gains and | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | on Securities | ​ | (Losses) on | ​ | ​ | ​
​ | ​ | Benefit | ​ | Available | ​ | Cash Flow | ​ | ​ | ​
(Dollars in thousands) | ​ | Plans | ​ | for Sale | ​ | Hedges | ​ | Total
Balance at December 31, 2018 | ​ | $ | (6,450) | ​ | $ | (18,394) | ​ | $ | (37) | ​ | $ | (24,881)
Other comprehensive income (loss) before reclassifications | ​ |  | 20 | ​ | ​ | 28,245 | ​ | ​ | (10,447) | ​ |  | 17,818
Amounts reclassified from accumulated other comprehensive income | ​ |  | 6,281 | ​ | ​ | 2,071 | ​ | ​ | (272) | ​ |  | 8,080
Net comprehensive income (loss) | ​ |  | 6,301 | ​ |  | 30,316 | ​ |  | (10,719) | ​ |  | 25,898
Balance at December 31, 2019 | ​ |  | (149) | ​ | ​ | 11,922 | ​ | ​ | (10,756) | ​ |  | 1,017
Other comprehensive income (loss) before reclassifications | ​ |  | (119) | ​ | ​ | 35,857 | ​ | ​ | (26,140) | ​ |  | 9,598
Amounts reclassified from accumulated other comprehensive income | ​ |  | 117 | ​ | ​ | (39) | ​ | ​ | 36,896 | ​ |  | 36,974
Net comprehensive income (loss) | ​ |  | (2) | ​ |  | 35,818 | ​ |  | 10,756 | ​ |  | 46,572
Balance at December 31, 2020 | ​ |  | (151) | ​ |  | 47,740 | ​ |  | — | ​ |  | 47,589
Other comprehensive income (loss) before reclassifications | ​ |  | 75 | ​ |  | (68,865) | ​ |  | — | ​ |  | (68,790)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 133 | ​ |  | (78) | ​ |  | — | ​ |  | 55
Net comprehensive income (loss) | ​ |  | 208 | ​ |  | (68,943) | ​ |  | — | ​ |  | (68,735)
Balance at December 31, 2021 | ​ | $ | 57 | ​ | $ | (21,203) | ​ | $ | — | ​ | $ | (21,146)
Schedule of reclassifications out of accumulated other comprehensive income (loss), net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amount Reclassified from Accumulated | ​ | ​ | ​
(Dollars in thousands) | ​ | For the Years Ended December 31, | ​ | ​ | ​
Accumulated Other Comprehensive Income (Loss) Component | ​ | 2021 |  | 2020 |  | 2019 |  | ​ | Income Statement Line Item Affected
Losses on cash flow hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate contracts | ​ | $ | — | ​ | $ | 47,303 | ​ | $ | (349) | ​ |  | Interest expense
​ | ​ | ​ | — | ​ |  | (10,407) | ​ | ​ | 77 | ​ |  | Provision for income taxes
​ | ​ | ​ | — | ​ |  | 36,896 | ​ | ​ | (272) | ​ |  | Net income
Gains on sales of available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | (102) | ​ | $ | (50) | ​ | $ | 2,655 | ​ | ​ | Securities gains (losses), net
​ | ​ | ​ | 24 | ​ | ​ | 11 | ​ | ​ | (584) | ​ | ​ | Provision for income taxes
​ | ​ | ​ | (78) | ​ | ​ | (39) | ​ | ​ | 2,071 | ​ | ​ | Net income
Losses and amortization of defined benefit pension: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Actuarial losses | ​ | $ | 174 | ​ | $ | 152 | ​ | $ | 8,053 | ​ |  | Salaries and employee benefits
​ | ​ | ​ | (41) | ​ |  | (35) | ​ | ​ | (1,772) | ​ |  | Provision for income taxes
​ | ​ | ​ | 133 | ​ |  | 117 | ​ | ​ | 6,281 | ​ |  | Net income
Total reclassifications for the period | ​ | $ | 55 | ​ | $ | 36,974 | ​ | $ | 8,080 | ​ | ​ | ​

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