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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables) | 12 Months Ended
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Dec. 31, 2022
ACCUMULATED OTHER COMPREHENSIVE LOSS |
Schedule of accumulated other comprehensive loss, net of tax | The following table presents the changes in each component of accumulated other comprehensive loss, net of tax, for the periods ending December 31, 2022, 2021, and 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | YEAR ENDING DECEMBER 31, 2022 | ​ | YEAR ENDED DECEMBER 31, 2021 | ​ | YEAR ENDING DECEMBER 31, 2020
​ |  | Net |  | ​ | ​ |  | ​ | ​ |  | Net |  | ​ | ​ |  | ​ | ​ |  | Net |  | ​ | ​ |  | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gains and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Gains and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Gains and | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Losses on | ​ | Defined | ​ | ​ | ​ | ​ | Losses on | ​ | Defined | ​ | ​ | ​ | ​ | Losses on | ​ | Defined | ​ | ​ | ​
​ | ​ | Investment | ​ | Benefit | ​ | ​ | ​ | ​ | Investment | ​ | Benefit | ​ | ​ | ​ | ​ | Investment | ​ | Benefit | ​ | ​ | ​
​ | ​ | Securities | ​ | Pension | ​ | ​ | ​ | ​ | Securities | ​ | Pension | ​ | ​ | ​ | ​ | Securities | ​ | Pension | ​ | ​ | ​
​ | ​ | AFS(1) | ​ | Items(1) | ​ | Total(1) | ​ | AFS(1) | ​ | Items(1) | ​ | Total(1) | ​ | AFS(1) | ​ | Items(1) | ​ | Total(1)
Beginning balance | ​ | $ | 1,386 | ​ | $ | (7,898) | ​ | $ | (6,512) | ​ | $ | 3,539 | ​ | $ | (16,737) | ​ | $ | (13,198) | ​ | $ | 1,715 | ​ | $ | (17,886) | ​ | $ | (16,171)
Other comprehensive income (loss) before reclassifications | ​ |  | (16,324) | ​ |  | (2,708) | ​ |  | (19,032) | ​ |  | (2,087) | ​ |  | 5,555 | ​ |  | 3,468 | ​ |  | 1,824 | ​ |  | (789) | ​ |  | 1,035
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | 3,024 | ​ |  | 3,024 | ​ |  | (66) | ​ |  | 3,284 | ​ |  | 3,218 | ​ |  | — | ​ |  | 1,938 | ​ |  | 1,938
Net current period other comprehensive income (loss) | ​ |  | (16,324) | ​ |  | 316 | ​ |  | (16,008) | ​ |  | (2,153) | ​ |  | 8,839 | ​ |  | 6,686 | ​ |  | 1,824 | ​ |  | 1,149 | ​ |  | 2,973
Ending balance | ​ | $ | (14,938) | ​ | $ | (7,582) | ​ | $ | (22,520) | ​ | $ | 1,386 | ​ | $ | (7,898) | ​ | $ | (6,512) | ​ | $ | 3,539 | ​ | $ | (16,737) | ​ | $ | (13,198)
(1) | Amounts in parentheses indicate debits on the Consolidated Balance Sheets.
Schedule of reclassification out of accumulated other comprehensive loss | The following table presents the amounts reclassified out of each component of accumulated other comprehensive loss for the periods ending December 31, 2022, 2021, and 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amount reclassified from accumulated | ​ | ​
​ | ​ | other comprehensive loss(1) | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Details about accumulated other | ​ | YEAR ENDING | ​ | YEAR ENDING | ​ | YEAR ENDING | ​ | Affected line item in the
comprehensive loss components |  | DECEMBER 31, 2022 |  | DECEMBER 31, 2021 |  | DECEMBER 31, 2020 |  | statement of operations
Realized gains on sale of securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | — | ​ | $ | (84) | ​ | $ | — | ​ | Net realized gains on investment securities
​ | ​ | ​ | — | ​ | ​ | 18 | ​ | ​ | — | ​ | Provision for income taxes
​ | ​ | $ | — | ​ | $ | (66) | ​ | $ | — |  | ​
Amortization of estimated defined benefit pension plan loss(2) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 3,828 | ​ | $ | 4,157 | ​ | $ | 2,453 |  | Other expense
​ | ​ |  | (804) | ​ |  | (873) | ​ |  | (515) |  | Provision for income taxes
​ | ​ | $ | 3,024 | ​ | $ | 3,284 | ​ | $ | 1,938 |  | ​
Total reclassifications for the period | ​ | $ | 3,024 | ​ | $ | 3,218 | ​ | $ | 1,938 |  | ​
(1) | Amounts in parentheses indicate credits.
(2) | These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (see Note 17 for additional details).

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