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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 14,503 $ 15,301 $ 48,108 $ 22,785
Other comprehensive income, before tax:        
Accumulated postretirement benefit obligation adjustment 0 0 0 (41)
Net unrealized (loss) gain on investments arising during the period (433) 61 (1,064) 1,093
Reclassification adjustment for sale of securities included in net income 11 0 (19) (30)
Reclassification adjustment for write-down of securities included in net income 0 0 0 482
Other comprehensive (loss) gain, before tax (422) 61 (1,083) 1,504
Income tax benefit related to postretirement health benefits 0 0 0 (9)
Income tax (benefit) expense related to net unrealized (gain) loss on investments arising during the period (91) 11 (225) 229
Income tax expense (benefit) related to reclassification adjustment for sale of securities included in net income 2 0 (4) (6)
Income tax expense related to reclassification adjustment for write-down of securities included in net income 0 0 0 110
Net income tax (benefit) expense on other comprehensive (loss) income (89) 11 (229) 324
Other comprehensive (loss) income (333) 50 (854) 1,180
Comprehensive Income $ 14,170 $ 15,351 $ 47,254 $ 23,965