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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2023
Accumulated Other Comprehensive Loss |
Schedule of components of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized Gains and | ​ | ​ | ​
​ | ​ | Benefit | ​ | (Losses) on Securities | ​ | ​ | ​
(Dollars in thousands) | ​ | Plans | ​ | Available for Sale | ​ | Total
Three Months Ended June 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at March 31, 2023 | ​ | $ | (673) | ​ | $ | (613,111) | ​ | $ | (613,784)
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (48,614) | ​ |  | (48,614)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | — | ​ |  | —
Net comprehensive loss | ​ |  | — | ​ |  | (48,614) | ​ |  | (48,614)
Balance at June 30, 2023 | ​ | $ | (673) | ​ | $ | (661,725) | ​ | $ | (662,398)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at March 31, 2022 | ​ | $ | 57 | ​ | $ | (294,013) | ​ | $ | (293,956)
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (196,928) | ​ | ​ | (196,928)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | — | ​ |  | —
Net comprehensive loss | ​ |  | — | ​ |  | (196,928) | ​ |  | (196,928)
Balance at June 30, 2022 | ​ | $ | 57 | ​ | $ | (490,941) | ​ | $ | (490,884)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2022 | ​ | $ | (673) | ​ | $ | (676,415) | ​ | $ | (677,088)
Other comprehensive income before reclassifications | ​ | ​ | — | ​ | ​ | 14,723 | ​ | ​ | 14,723
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | (33) | ​ |  | (33)
Net comprehensive income | ​ |  | — | ​ |  | 14,690 | ​ |  | 14,690
Balance at June 30, 2023 | ​ | $ | (673) | ​ | $ | (661,725) | ​ | $ | (662,398)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2021 | ​ | $ | 57 | ​ | $ | (21,203) | ​ | $ | (21,146)
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (469,738) | ​ |  | (469,738)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | — | ​ |  | —
Net comprehensive loss | ​ |  | — | ​ |  | (469,738) | ​ |  | (469,738)
Balance at June 30, 2022 | ​ | $ | 57 | ​ | $ | (490,941) | ​ | $ | (490,884)
Schedule of reclassifications out of accumulated other comprehensive (loss) income, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | ​ | ​
(Dollars in thousands) | ​ | For the Three Months Ended June 30, | ​ | For the Six Months Ended June 30, | ​ | ​
Accumulated Other Comprehensive Income (Loss) Component |  | 2023 |  | 2022 |  | 2023 |  | 2022 |  | Income Statement Line Item Affected
Gains on sales of available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | — | ​ | $ | — | ​ | $ | (45) | ​ | $ | — | ​ | Securities gains, net
​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 12 | ​ | ​ | — | ​ | Provision for income taxes
​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (33) | ​ | ​ | — | ​ | Net income
Total reclassifications for the period | ​ | $ | — | ​ | $ | — | ​ | $ | (33) | ​ | $ | — | ​ | ​

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