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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2016 | ​ | $ | (6,195) | ​ | $ | (1,708) | ​ | $ | (308) | ​ | $ | (8,211)
Other comprehensive loss before reclassifications | ​ |  | (365) | ​ |  | (2,157) | ​ |  | (13) | ​ |  | (2,535)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 562 | ​ |  | (413) | ​ |  | 170 | ​ |  | 319
Net comprehensive income (loss) | ​ |  | 197 | ​ |  | (2,570) | ​ |  | 157 | ​ |  | (2,216)
Balance at December 31, 2017 | ​ |  | (5,998) | ​ |  | (4,278) | ​ |  | (151) | ​ |  | (10,427)
Other comprehensive loss before reclassifications | ​ |  | 382 | ​ |  | (13,479) | ​ |  | 33 | ​ |  | (13,064)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 926 | ​ |  | 510 | ​ |  | 121 | ​ |  | 1,557
Net comprehensive income (loss) | ​ |  | 1,308 | ​ |  | (12,969) | ​ |  | 154 | ​ |  | (11,507)
AOCI reclassification to retained earnings from the adoption of ASU 2018-02 | ​ | ​ | (1,760) | ​ |  | (1,147) | ​ |  | (40) | ​ |  | (2,947)
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
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 |  | ​ | 2019 |  | 2018 |  | 2017 |  | ​ | Income Statement Line Item Affected
Gains (losses) on cash flow hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate contracts | ​ | ​ | $ | (349) | ​ | $ | 155 | ​ | $ | 275 | ​ |  | Interest expense
​ | ​ | ​ | ​ | 77 | ​ |  | (34) | ​ | ​ | (105) | ​ |  | Provision for income taxes
​ | ​ | ​ | ​ | (272) | ​ |  | 121 | ​ | ​ | 170 | ​ |  | Net income
(Gains) losses on sales of available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | $ | 2,655 | ​ | $ | 655 | ​ | $ | (1,421) | ​ | ​ | Securities gains (losses), net
​ | ​ | ​ | ​ | (584) | ​ | ​ | (145) | ​ | ​ | 542 | ​ | ​ | Provision for income taxes
​ | ​ | ​ | ​ | 2,071 | ​ | ​ | 510 | ​ | ​ | (879) | ​ | ​ | Net income
Other-than-temporary impairment losses on available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | $ | — | ​ | $ | — | ​ | $ | 753 | ​ | ​ | Other-than-temporary impairment losses
​ | ​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (287) | ​ | ​ | Provision for income taxes
​ | ​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 466 | ​ | ​ | Net income
Losses and amortization of defined benefit pension: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Actuarial losses | ​ | ​ | $ | 8,053 | ​ | $ | 1,187 | ​ | $ | 908 | ​ |  | Salaries and employee benefits /Pension Plan Termination Expense
​ | ​ | ​ | ​ | (1,772) | ​ |  | (261) | ​ | ​ | (346) | ​ |  | Provision for income taxes
​ | ​ | ​ | ​ | 6,281 | ​ |  | 926 | ​ | ​ | 562 | ​ |  | Net income
Total reclassifications for the period | ​ | ​ | $ | 8,080 | ​ | $ | 1,557 | ​ | $ | 319 | ​ | ​ | ​

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