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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of changes in accumulated other comprehensive income (loss) by component | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized Gains | ​ | Unrealized Gains | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Losses) on | ​ | (Losses) on | ​ | ​ | ​ | ​ | Fair Value | ​ | ​ | ​
​ | ​ | Available for Sale | ​ | Cash flow | ​ | Defined Benefit | ​ | Option Elected | ​ | ​ | ​
December 31, 2020 |  | Securities |  | Hedges |  | Pension Items |  | on Liabilities |  | Total
​ |  | (In thousands)
Beginning balance, net of tax | ​ | $ | (3,982) | ​ | $ | (5,863) | ​ | $ | (983) | ​ | $ | 1,021 | ​ | $ | (9,807)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income before reclassifications, net of tax | ​ |  | 4,787 | ​ |  | (14,924) | ​ |  | (1,112) | ​ |  | 828 | ​ |  | (10,421)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | ​ |  | 485 | ​ |  | 3,266 | ​ |  | 211 | ​ |  | — | ​ |  | 3,962
Net current period other comprehensive income, net of tax | ​ |  | 5,272 | ​ |  | (11,658) | ​ |  | (901) | ​ |  | 828 | ​ |  | (6,459)
Ending balance, net of tax | ​ | $ | 1,290 | ​ | $ | (17,521) | ​ | $ | (1,884) | ​ | $ | 1,849 | ​ | $ | (16,266)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized Gains | ​ | Unrealized Gains | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Losses) on | ​ | (Losses) on | ​ | ​ | ​ | ​ | Fair Value | ​ | ​ | ​
​ | ​ | Available for Sale | ​ | Cash flow | ​ | Defined Benefit | ​ | Option Elected | ​ | ​ | ​
December 31, 2019 |  | Securities |  | Hedges |  | Pension Items |  | on Liabilities |  | Total
​ |  | (In thousands)
Beginning balance, net of tax | ​ | $ | (15,649) | ​ | $ | 3,704 | ​ | $ | (1,673) | ​ | $ | 866 | ​ | $ | (12,752)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income before reclassifications, net of tax | ​ |  | 11,657 | ​ |  | (8,606) | ​ |  | 661 | ​ |  | 155 | ​ |  | 3,867
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | ​ |  | 10 | ​ |  | (961) | ​ |  | 29 | ​ |  | — | ​ |  | (922)
Net current period other comprehensive income, net of tax | ​ |  | 11,667 | ​ |  | (9,567) | ​ |  | 690 | ​ |  | 155 | ​ |  | 2,945
Ending balance, net of tax | ​ | $ | (3,982) | ​ | $ | (5,863) | ​ | $ | (983) | ​ | $ | 1,021 | ​ | $ | (9,807)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized Gains |  | Unrealized Gains |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | (Losses) on | ​ | (Losses) on | ​ | ​ | ​ | ​ | ​ | Fair Value | ​ | ​ | ​
​ | ​ | Available for Sale | ​ | Cash flow | ​ | Defined Benefit | ​ | ​ | Option Elected | ​ | ​ | ​
December 31, 2018 |  | Securities |  | Hedges |  | Pension Items |  | ​ | on Liabilities | ​ | Total
​ |  | (In thousands)
Beginning balance, net of tax | ​ | $ | (5,522) | ​ | $ | 231 | ​ | $ | (3,695) | ​ | $ | — | ​ | $ | (8,986)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings | ​ |  | (1,325) | ​ |  | 50 | ​ |  | (798) | ​ |  | — | ​ |  | (2,073)
Impact of adoption of Accounting Standard Update 2016-01 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 779 | ​ |  | 779
Other comprehensive income before reclassifications, net of tax | ​ |  | (10,127) | ​ |  | 3,351 | ​ |  | 2,484 | ​ |  | 87 | ​ |  | (4,205)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | ​ |  | 1,325 | ​ |  | 72 | ​ |  | 336 | ​ |  | — | ​ |  | 1,733
Net current period other comprehensive income, net of tax | ​ |  | (8,802) | ​ |  | 3,423 | ​ |  | 2,820 | ​ |  | 87 | ​ |  | (2,472)
Ending balance, net of tax | ​ | $ | (15,649) | ​ | $ | 3,704 | ​ | $ | (1,673) | ​ | $ | 866 | ​ | $ | (12,752)
Schedule of amounts reclassified from accumulated other comprehensive income (loss) by component | ​
​ | ​ | ​ | ​ | ​ | ​
For the Year Ended December 31, 2020
​ | ​ | Amounts Reclassified from | ​ | ​
Details about Accumulated Other | ​ | Accumulated Other | ​ | Affected Line Item in the Statement
Comprehensive Income Components |  | Comprehensive Income |  | Where Net Income is Presented
(Dollars in thousands)
Unrealized gains (losses) on available for sale securities: | ​ | $ | (701) |  | Net loss on sale of securities
​ | ​ |  | 216 |  | Tax expense
​ | ​ | $ | (485) |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Cash flow hedges: | ​ |  |  |  |
Interest rate swaps | ​ | $ | (4,732) |  | Interest expense
​ | ​ |  | 1,466 |  | Tax expense
​ | ​ | $ | (3,266) |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Amortization of defined benefit pension items: | ​ |  |  |  |
Actuarial losses | ​ | $ | (390) | (1) | Other operating expenses
Prior service credits | ​ |  | 85 | (1) | Other operating expenses
​ | ​ |  | (305) |  | Total before tax
​ | ​ |  | 94 |  | Tax expense
​ | ​ | $ | (211) |  | Net of tax
(1) | These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 13 of the Notes to Consolidated Financial Statements “Pension and Other Postretirement Benefit Plans”).
​
​ | ​ | ​ | ​ | ​ | ​
For the Year Ended December 31, 2019
​ | ​ | Amounts Reclassified from | ​ | ​
Details about Accumulated Other | ​ | Accumulated Other | ​ | Affected Line Item in the Statement
Comprehensive Income Components |  | Comprehensive Income |  | Where Net Income is Presented
(Dollars in thousands)
Unrealized gains (losses) on available for sale securities: | ​ | $ | (15) |  | Net loss on sale of securities
​ | ​ |  | 5 |  | Tax expense
​ | ​ | $ | (10) |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Cash flow hedges: | ​ |  |  |  |
Interest rate swaps | ​ | $ | 1,392 |  | Interest expense
​ | ​ |  | (431) |  | Tax expense
​ | ​ | $ | 961 |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Amortization of defined benefit pension items: | ​ |  |  |  |
Actuarial losses | ​ | $ | (128) | (1) | Other operating expenses
Prior service credits | ​ |  | 85 | (1) | Other operating expenses
​ | ​ |  | (43) |  | Total before tax
​ | ​ |  | 14 |  | Tax expense
​ | ​ | $ | (29) |  | Net of tax
(1) | These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 13 of the Notes to Consolidated Financial Statements “Pension and Other Postretirement Benefit Plans”).
​
​ | ​ | ​ | ​ | ​ | ​
For the Year Ended December 31, 2018
​ | ​ | Amounts Reclassified from | ​ | ​
Details about Accumulated Other | ​ | Accumulated Other | ​ | Affected Line Item in the Statement
Comprehensive Income Components |  | Comprehensive Income |  | Where Net Income is Presented
(Dollars in thousands)
Unrealized gains (losses) on available for sale securities: | ​ | $ | (1,920) |  | Net loss on sale of securities
​ | ​ |  | 595 |  | Tax expense
​ | ​ | $ | (1,325) |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Cash flow hedges: | ​ |  |  |  |
Interest rate swaps | ​ | $ | (104) |  | Interest expense
​ | ​ |  | 32 |  | Tax expense
​ | ​ | $ | (72) |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Amortization of defined benefit pension items: | ​ |  |  |  |
Actuarial losses | ​ | $ | (530) | (1) | Other operating expenses
Prior service credits | ​ |  | 39 | (1) | Other operating expenses
​ | ​ |  | (491) |  | Total before tax
​ | ​ |  | 155 |  | Tax expense
​ | ​ | $ | (336) |  | Net of tax
(1) | These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 13 of the Notes to Consolidated Financial Statements “Pension and Other Postretirement Benefit Plans”).

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