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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Statement of Comprehensive Income [Abstract]        
Net income $ 2,279 $ 19,782 $ 8,464 $ 33,605
Other comprehensive income, before tax:        
Accumulated postretirement benefit obligation adjustment (8) 0 211 0
Net unrealized (losses) gains on investments arising during the period (1,178) 59 (3,942) (691)
Reclassification adjustment for sale of securities included in net income 46 53 46 30
Reclassification adjustment for write-down of securities included in net income 127 0 127 0
Other comprehensive (loss) income, before income tax (1,013) 112 (3,558) (661)
Income tax (benefit) expense related to postretirement health benefits (2) 0 44 0
Income tax (benefit) expense related to net unrealized (losses) gains on investments arising during the period (252) 12 (835) (146)
Income tax expense related to reclassification adjustment for sale of securities included in net income 10 11 10 6
Income tax expense related to reclassification adjustment for write-down of securities included in net income 29 0 29 0
Net income tax (benefit) expense on other comprehensive (loss) income (215) 23 (752) (140)
Other comprehensive (loss) income (798) 89 (2,806) (521)
Comprehensive Income $ 1,481 $ 19,871 $ 5,658 $ 33,084