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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Statement of Comprehensive Income [Abstract]        
Net income $ 7,913 $ 14,503 $ 16,377 $ 48,108
Other comprehensive income, before tax:        
Accumulated postretirement benefit obligation adjustment 17 0 228 0
Net unrealized losses on investments arising during the period (1,595) (433) (5,537) (1,064)
Reclassification adjustment for sale of securities included in net income 58 11 104 (19)
Reclassification adjustment for write-down of securities included in net income 35 0 162 0
Other comprehensive loss, before income tax (1,485) (422) (5,043) (1,083)
Income tax expense related to postretirement health benefits 4 0 48 0
Income tax benefit related to net unrealized losses on investments arising during the period (338) (91) (1,173) (225)
Income tax expense (benefit) related to reclassification adjustment for sale of securities included in net income 12 2 22 (4)
Income tax expense related to reclassification adjustment for write-down of securities included in net income 8 0 37 0
Net income tax benefit on other comprehensive loss (314) (89) (1,066) (229)
Other comprehensive loss (1,171) (333) (3,977) (854)
Comprehensive Income $ 6,742 $ 14,170 $ 12,400 $ 47,254