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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Stockholders' Equity |
Schedule of the change in the components of the accumulated other comprehensive loss | The following details the change in the components of the Company’s accumulated other comprehensive income (loss) for the three months ended March 31, 2021 and 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | ​ | ​ | ​ | Unrecognized Net | ​ | Other
​ | ​ | Unrealized | ​ | Pension and | ​ | Comprehensive
​ | ​ | Gains (Losses) | ​ | Postretirement | ​ | Income
(in thousands) |  | on Securities (1) |  | Costs (2) |  | (Loss)
Balance at beginning of period | ​ | $ | 3,353 | ​ | $ | (1,825) | ​ | $ | 1,528
Other comprehensive income, before reclassifications | ​ |  | (3,518) | ​ |  | 45 | ​ |  | (3,473)
Amounts reclassified from accumulated other comprehensive (loss) income | ​ |  | (2) | ​ |  | — | ​ |  | (2)
Current period other comprehensive income (loss), before tax | ​ |  | (3,520) | ​ |  | 45 | ​ |  | (3,475)
Income tax benefit (expense) | ​ |  | 740 | ​ |  | (10) | ​ |  | 730
Current period other comprehensive income (loss), net of tax | ​ |  | (2,780) | ​ |  | 35 | ​ |  | (2,745)
Balance at end of period | ​ | $ | 573 | ​ | $ | (1,790) | ​ | $ | (1,217)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | ​ | ​ | ​ | Unrecognized Net | ​ | Other
​ | ​ | Unrealized | ​ | Pension and | ​ | Comprehensive
​ | ​ | Gains (Losses) | ​ | Postretirement | ​ | Income
(in thousands) |  | on Securities (1) |  | Costs (2) |  | (Loss)
Balance at beginning of period | ​ | $ | (23) | ​ | $ | (3,732) | ​ | $ | (3,755)
Other comprehensive income, before reclassifications | ​ |  | 2,760 | ​ |  | 67 | ​ |  | 2,827
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | — | ​ |  | — | ​ |  | —
Current period other comprehensive income, before tax | ​ |  | 2,760 | ​ |  | 67 | ​ |  | 2,827
Income tax expense | ​ |  | (580) | ​ |  | (14) | ​ |  | (594)
Current period other comprehensive income, net of tax | ​ |  | 2,180 | ​ |  | 53 | ​ |  | 2,233
Balance at end of period | ​ | $ | 2,157 | ​ | $ | (3,679) | ​ | $ | (1,522)
(1) | The pre-tax amounts reclassified from accumulated other comprehensive income (loss) are included in investment securities gains (losses), net 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.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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