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Accumulated Other Comprehensive (Loss) Income (Tables) | 12 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive (Loss) Income |
Schedule of components of accumulated other comprehensive (loss) income, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized Gains and | ​ | ​ | ​
​ | ​ | Benefit | ​ | (Losses) on Securities | ​ | ​ | ​
(Dollars in thousands) | ​ | Plans | ​ | Available for Sale | ​ | Total
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)
Other comprehensive loss before reclassifications | ​ |  | (838) | ​ | ​ | (655,189) | ​ |  | (656,027)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 108 | ​ | ​ | (23) | ​ |  | 85
Net comprehensive loss | ​ |  | (730) | ​ |  | (655,212) | ​ |  | (655,942)
Balance at December 31, 2022 | ​ |  | (673) | ​ |  | (676,415) | ​ |  | (677,088)
Other comprehensive income before reclassifications | ​ |  | 1,086 | ​ |  | 93,285 | ​ |  | 94,371
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 214 | ​ |  | (33) | ​ |  | 181
Net comprehensive gain | ​ |  | 1,300 | ​ |  | 93,252 | ​ |  | 94,552
Balance at December 31, 2023 | ​ | $ | 627 | ​ | $ | (583,163) | ​ | $ | (582,536)
Schedule of reclassifications out of accumulated other comprehensive income, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amount Reclassified from Accumulated | ​ | ​ | ​
​ | ​ | Other Comprehensive Income (Loss) | ​ | ​ | ​
(Dollars in thousands) | ​ | For the Years Ended December 31, | ​ | ​ | ​
Accumulated Other Comprehensive Income (Loss) Component | ​ | 2023 |  | 2022 |  | 2021 |  | ​ | Income Statement Line Item Affected
Gains on sales of available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | (43) | ​ | $ | (30) | ​ | $ | (102) | ​ | ​ | Securities gains, net
​ | ​ | ​ | 10 | ​ | ​ | 7 | ​ | ​ | 24 | ​ | ​ | Provision for income taxes
​ | ​ | ​ | (33) | ​ | ​ | (23) | ​ | ​ | (78) | ​ | ​ | Net income
Losses and amortization of defined benefit pension: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Actuarial losses | ​ | $ | 285 | ​ | $ | 143 | ​ | $ | 174 | ​ |  | Salaries and employee benefits
​ | ​ | ​ | (71) | ​ |  | (35) | ​ | ​ | (41) | ​ |  | Provision for income taxes
​ | ​ | ​ | 214 | ​ |  | 108 | ​ | ​ | 133 | ​ |  | Net income
Total reclassifications for the period | ​ | $ | 181 | ​ | $ | 85 | ​ | $ | 55 | ​ | ​ | ​
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