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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss). |
Schedule of components of accumulated other comprehensive (loss) income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized Gains and | ​ | ​ | ​
​ | ​ | Benefit | ​ | (Losses) on Securities | ​ | ​ | ​
(Dollars in thousands) | ​ | Plans | ​ | Available for Sale | ​ | Total
Three Months Ended September 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at June 30, 2022 | ​ | $ | 57 | ​ | $ | (490,941) | ​ | $ | (490,884)
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (225,551) | ​ |  | (225,551)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | (23) | ​ |  | (23)
Net comprehensive loss | ​ |  | — | ​ |  | (225,574) | ​ |  | (225,574)
Balance at September 30, 2022 | ​ | $ | 57 | ​ | $ | (716,515) | ​ | $ | (716,458)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at June 30, 2021 | ​ | $ | (151) | ​ | $ | 24,287 | ​ | $ | 24,136
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (24,607) | ​ | ​ | (24,607)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | (49) | ​ |  | (49)
Net comprehensive loss | ​ |  | — | ​ |  | (24,656) | ​ |  | (24,656)
Balance at September 30, 2021 | ​ | $ | (151) | ​ | $ | (369) | ​ | $ | (520)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2021 | ​ | $ | 57 | ​ | $ | (21,203) | ​ | $ | (21,146)
Other comprehensive loss before reclassifications | ​ | ​ | — | ​ | ​ | (695,289) | ​ | ​ | (695,289)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | (23) | ​ |  | (23)
Net comprehensive loss | ​ |  | — | ​ |  | (695,312) | ​ |  | (695,312)
Balance at September 30, 2022 | ​ | $ | 57 | ​ | $ | (716,515) | ​ | $ | (716,458)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2020 | ​ | $ | (151) | ​ | $ | 47,740 | ​ | $ | 47,589
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (48,033) | ​ |  | (48,033)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | (76) | ​ |  | (76)
Net comprehensive loss | ​ |  | — | ​ |  | (48,109) | ​ |  | (48,109)
Balance at September 30, 2021 | ​ | $ | (151) | ​ | $ | (369) | ​ | $ | (520)
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 September 30, | ​ | For the Nine Months Ended September 30, | ​ | ​
Accumulated Other Comprehensive Income (Loss) Component |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | Income Statement Line Item Affected
Gains on sales of available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | (30) | ​ | $ | (64) | ​ | $ | (30) | ​ | $ | (100) | ​ | Securities gains, net
​ | ​ | ​ | 7 | ​ | ​ | 15 | ​ | ​ | 7 | ​ | ​ | 24 | ​ | Provision for income taxes
​ | ​ | ​ | (23) | ​ | ​ | (49) | ​ | ​ | (23) | ​ | ​ | (76) | ​ | Net income
Total reclassifications for the period | ​ | $ | (23) | ​ | $ | (49) | ​ | $ | (23) | ​ | $ | (76) | ​ | ​

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