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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity |
Schedule of the change in the components of the accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrecognized Net | ​ | Accumulated
​ | ​ | Unrealized | ​ | Pension and | ​ | Other
​ | ​ | Income (Loss) | ​ | Postretirement | ​ | Comprehensive
(in thousands) |  | on Securities (1) |  | Costs (2) |  | Income (Loss)
Balance, December 31, 2018 | ​ | $ | (3,455) | ​ | $ | (2,644) | ​ | $ | (6,099)
Other comprehensive income, before reclassifications | ​ |  | 4,304 | ​ |  | 79 | ​ |  | 4,383
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 40 | ​ |  | (1,455) | ​ |  | (1,415)
Other comprehensive income (loss), before tax | ​ |  | 4,344 | ​ |  | (1,376) | ​ |  | 2,968
Income tax (expense) benefit | ​ |  | (912) | ​ |  | 288 | ​ |  | (624)
Other comprehensive income (loss), net of tax | ​ |  | 3,432 | ​ |  | (1,088) | ​ |  | 2,344
Balance, December 31, 2019 | ​ | $ | (23) | ​ | $ | (3,732) | ​ | $ | (3,755)
Other comprehensive income, before reclassifications | ​ |  | 4,315 | ​ |  | 214 | ​ |  | 4,529
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | (41) | ​ |  | 2,200 | ​ |  | 2,159
Other comprehensive income, before tax | ​ |  | 4,274 | ​ |  | 2,414 | ​ |  | 6,688
Income tax expense | ​ |  | (898) | ​ |  | (507) | ​ |  | (1,405)
Other comprehensive income, net of tax | ​ |  | 3,376 | ​ |  | 1,907 | ​ |  | 5,283
Balance, December 31, 2020 | ​ | $ | 3,353 | ​ | $ | (1,825) | ​ | $ | 1,528
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) | The pre-tax amounts reclassified from accumulated other comprehensive income (loss) income are included in gains (losses) on sale of investment securities in the consolidated statements of income.
(2) | The pre-tax amounts reclassified from accumulated other comprehensive income (loss) are included in the computation of net periodic pension cost. See Note 13.

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