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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2024
Summary of Significant Accounting Policies |
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, 2024 |  | Securities |  | Hedges |  | Pension Items |  | on Liabilities |  | Total
​ |  | (In thousands)
Beginning balance, net of tax | ​ | $ | (54,744) | ​ | $ | 14,796 | ​ | $ | (381) | ​ | $ | 1,678 | ​ | $ | (38,651)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) before reclassifications, net of tax | ​ |  | 429 | ​ |  | 13,449 | ​ |  | (213) | ​ |  | (94) | ​ |  | 13,571
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | ​ |  | 49,984 | ​ |  | (17,517) | ​ |  | (254) | ​ |  | — | ​ |  | 32,213
Net current period other comprehensive income (loss), net of tax | ​ |  | 50,413 | ​ |  | (4,068) | ​ |  | (467) | ​ |  | (94) | ​ |  | 45,784
Ending balance, net of tax | ​ | $ | (4,331) | ​ | $ | 10,728 | ​ | $ | (848) | ​ | $ | 1,584 | ​ | $ | 7,133
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized Gains | ​ | Unrealized Gains | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Losses) on | ​ | (Losses) on | ​ | ​ | ​ | ​ | Fair Value | ​ | ​ | ​
​ | ​ | Available for Sale | ​ | Cash flow | ​ | Defined Benefit | ​ | Option Elected | ​ | ​ | ​
December 31, 2023 |  | Securities |  | Hedges |  | Pension Items |  | on Liabilities |  | Total
​ |  | (In thousands)
Beginning balance, net of tax | ​ | $ | (63,106) | ​ | $ | 25,380 | ​ | $ | (275) | ​ | $ | 1,513 | ​ | $ | (36,488)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) before reclassifications, net of tax | ​ |  | 8,362 | ​ |  | 6,943 | ​ |  | 170 | ​ |  | 165 | ​ |  | 15,640
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | ​ |  | — | ​ |  | (17,527) | ​ |  | (276) | ​ |  | — | ​ |  | (17,803)
Net current period other comprehensive income (loss), net of tax | ​ |  | 8,362 | ​ |  | (10,584) | ​ |  | (106) | ​ |  | 165 | ​ |  | (2,163)
Ending balance, net of tax | ​ | $ | (54,744) | ​ | $ | 14,796 | ​ | $ | (381) | ​ | $ | 1,678 | ​ | $ | (38,651)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized Gains |  | Unrealized Gains |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | (Losses) on | ​ | (Losses) on | ​ | ​ | ​ | ​ | ​ | Fair Value | ​ | ​ | ​
​ | ​ | Available for Sale | ​ | Cash flow | ​ | Defined Benefit | ​ | ​ | Option Elected | ​ | ​ | ​
December 31, 2022 |  | Securities |  | Hedges |  | Pension Items |  | ​ | on Liabilities | ​ | Total
​ |  | (In thousands)
Beginning balance, net of tax | ​ | $ | (6,272) | ​ | $ | (1,406) | ​ | $ | (1,282) | ​ | $ | 2,276 | ​ | $ | (6,684)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) before reclassifications, net of tax | ​ |  | (64,381) | ​ |  | 23,812 | ​ |  | 1,043 | ​ |  | (763) | ​ |  | (40,289)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | ​ |  | 7,547 | ​ |  | 2,974 | ​ |  | (36) | ​ |  | — | ​ |  | 10,485
Net current period other comprehensive income (loss), net of tax | ​ |  | (56,834) | ​ |  | 26,786 | ​ |  | 1,007 | ​ |  | (763) | ​ |  | (29,804)
Ending balance, net of tax | ​ | $ | (63,106) | ​ | $ | 25,380 | ​ | $ | (275) | ​ | $ | 1,513 | ​ | $ | (36,488)
Schedule of amounts reclassified from accumulated other comprehensive income (loss) by component | ​
​ | ​ | ​ | ​ | ​ | ​
For the year ended December 31, 2024
​ | ​ | Amounts Reclassified from | ​ | ​
Details about Accumulated Other | ​ | Accumulated Other | ​ | Affected Line Item in the Statement
Comprehensive Income Components |  | Comprehensive Income (Loss) |  | Where Net Income (Loss) is Presented
(In thousands)
Unrealized gains (losses) on available for sale securities: | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | (72,315) | ​ | Net gain (loss) on sale of securities
​ | ​ |  | 22,331 | ​ | Provision for income taxes
​ | ​ | $ | (49,984) | ​ | Net of tax
Cash flow hedges: | ​ |  |  | ​ |
Interest rate swaps benefit (expense) | ​ | $ | 25,344 |  | Interest expense
​ | ​ |  | (7,827) |  | Provision for income taxes
​ | ​ | $ | 17,517 |  | ​
​ | ​ | ​ | ​ | ​ | ​
Amortization of defined benefit pension items: | ​ |  |  | ​ |
Actuarial losses benefit (expense) | ​ | $ | 367 | (1) | Other operating expense
​ | ​ |  | (113) |  | Provision for income taxes
​ | ​ | $ | 254 |  | ​
​
​ | ​ | ​ | ​ | ​ | ​
For the year ended December 31, 2023
​ | ​ | Amounts Reclassified from | ​ | ​
Details about Accumulated Other | ​ | Accumulated Other | ​ | Affected Line Item in the Statement
Comprehensive Income Components |  | Comprehensive Income (Loss) |  | Where Net Income (Loss) is Presented
(In thousands)
Cash flow hedges: | ​ |  |  |  |
Interest rate swaps benefit (expense) | ​ | $ | 25,424 |  | Interest expense
​ | ​ |  | (7,897) |  | Provision for income taxes
​ | ​ | $ | 17,527 |  | ​
​ | ​ | ​ | ​ | ​ | ​
Amortization of defined benefit pension items: | ​ |  |  | ​ |
Actuarial losses benefit (expense) | ​ | $ | 399 | (1) | Other operating expense
​ | ​ |  | (123) | ​ | Provision for income taxes
​ | ​ | $ | 276 |  | ​
​
​ | ​ | ​ | ​ | ​ | ​
For the year ended December 31, 2022
​ | ​ | 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
(In thousands)
Unrealized gains (losses) on available for sale securities: | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | (10,948) |  | Net gain (loss) on sale of securities
​ | ​ |  | 3,401 |  | Provision for income taxes
​ | ​ | $ | (7,547) |  | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Cash flow hedges: | ​ |  |  |  |
Interest rate swaps benefit (expense) | ​ | $ | (4,341) |  | Interest expense
​ | ​ |  | 1,367 |  | Provision for income taxes
​ | ​ | $ | (2,974) | ​ | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Amortization of defined benefit pension items: | ​ |  |  | ​ |
Actuarial losses benefit (expense) | ​ | $ | 24 | (1) | Other operating expenses
Prior service credits benefit (expense) | ​ |  | 27 | (1) | Other operating expenses
​ | ​ |  | 51 | ​ | Total before tax
​ | ​ |  | (15) |  | Provision for income taxes
​ | ​ | $ | 36 |  | ​
(1) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 12 (“Pension and Other Postretirement Benefit Plans”) for additional information.

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