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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2020
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
Three Months Ended March 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2019 | ​ | $ | (149) | ​ | $ | 11,922 | ​ | $ | (10,756) | ​ | $ | 1,017
Other comprehensive gain (loss) before reclassifications | ​ |  | — | ​ |  | 31,551 | ​ |  | (22,240) | ​ |  | 9,311
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | — | ​ |  | (563) | ​ |  | (563)
Net comprehensive income (loss) | ​ |  | — | ​ |  | 31,551 | ​ |  | (22,803) | ​ |  | 8,748
Balance at March 31, 2020 | ​ | $ | (149) | ​ | $ | 43,473 | ​ | $ | (33,559) | ​ | $ | 9,765
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended March 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2018 | ​ | $ | (6,450) | ​ | $ | (18,394) | ​ | $ | (37) | ​ | $ | (24,881)
Other comprehensive gain (loss) before reclassifications | ​ |  | — | ​ |  | 15,827 | ​ |  | (2,068) | ​ | ​ | 13,759
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 95 | ​ |  | (2,339) | ​ |  | (8) | ​ |  | (2,252)
Net comprehensive income (loss) | ​ |  | 95 | ​ |  | 13,488 | ​ |  | (2,076) | ​ |  | 11,507
Balance at March 31, 2019 | ​ | $ | (6,355) | ​ | $ | (4,906) | ​ | $ | (2,113) | ​ | $ | (13,374)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of reclassifications out of accumulated other comprehensive income (loss), net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | ​
(Dollars in thousands) | ​ | For the Three Months Ended March 31, | ​ | ​
Accumulated Other Comprehensive Income (Loss) Component |  | 2020 |  | 2019 |  | Income Statement Line Item Affected
Losses on cash flow hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate contracts | ​ | $ | (722) | ​ | $ | (10) | ​ | Interest expense
​ | ​ | ​ | 159 | ​ | ​ | 2 | ​ | Provision for income taxes
​ | ​ | ​ | (563) | ​ | ​ | (8) | ​ | Net income
Losses on sales of available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | — | ​ | $ | (2,998) | ​ | Securities gains (losses), net
​ | ​ | ​ | — | ​ | ​ | 659 | ​ | Provision for income taxes
​ | ​ | ​ | — | ​ | ​ | (2,339) | ​ | Net income
Losses and amortization of defined benefit pension: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Actuarial losses | ​ | $ | — | ​ | $ | 121 | ​ | Salaries and employee benefits
​ | ​ | ​ | — | ​ | ​ | (26) | ​ | Provision for income taxes
​ | ​ | ​ | — | ​ | ​ | 95 | ​ | Net income
Total reclassifications for the period | ​ | $ | (563) | ​ | $ | (2,252) | ​ | ​

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