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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2021
Stockholders' Equity |
Stockholders' Equity | (9) Stockholders’ Equity Accumulated Other Comprehensive Income (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 The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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