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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2022
Accumulated Other Comprehensive Income |
Schedule of changes in accumulated other comprehensive income (AOCI) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2022 |  | 2021 |  | 2020 |
​ | ​ | (in thousands) |
Balance as of January 1 | ​ | $ | 5,312 | ​ | $ | 13,246 | ​ | $ | 4,686 | ​
Other comprehensive income (loss) before reclassification | ​ |  | (55,270) | ​ | ​ | (9,579) | ​ | ​ | 11,292 | ​
Federal income tax (expense) benefit | ​ |  | 11,607 | ​ | ​ | 2,012 | ​ | ​ | (2,371) | ​
Other comprehensive income (loss) before reclassification, net of tax | ​ |  | (43,663) | ​ |  | (7,567) | ​ |  | 8,921 | ​
Amounts reclassified from AOCI | ​ |  | 2,325 | ​ | ​ | (464) | ​ | ​ | (456) | ​
Federal income tax expense (benefit) | ​ |  | (489) | ​ | ​ | 97 | ​ | ​ | 95 | ​
Amounts reclassified from AOCI, net of tax | ​ |  | 1,836 | ​ |  | (367) | ​ |  | (361) | ​
Other comprehensive income (loss) | ​ |  | (41,827) | ​ |  | (7,934) | ​ |  | 8,560 | ​
Balance at end of period | ​ | $ | (36,515) | ​ | $ | 5,312 | ​ | $ | 13,246 | ​

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