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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 7,084 $ 7,913 $ 15,850 $ 16,377
Other comprehensive (loss) income, before tax:        
Accumulated postretirement (benefit) expense obligation adjustment (7) 17 127 228
Net unrealized losses on investments arising during the period (1,250) (1,595) (1,547) (5,537)
Reclassification adjustment for sale of securities included in net income 0 58 0 104
Reclassification adjustment for write-down of securities included in net income 96 35 208 162
Other comprehensive loss, before income tax (1,161) (1,485) (1,212) (5,043)
Income tax (benefit) expense related to postretirement health benefits (1) 4 27 48
Income tax benefit related to net unrealized losses on investments arising during the period (266) (338) (332) (1,173)
Income tax expense related to reclassification adjustment for sale of securities included in net income 0 12 0 22
Income tax expense related to reclassification adjustment for write-down of securities included in net income 22 8 48 37
Net income tax benefit on other comprehensive loss (245) (314) (257) (1,066)
Other Comprehensive Income (Loss), Net of Tax, Total (916) (1,171) (955) (3,977)
Comprehensive Income $ 6,168 $ 6,742 $ 14,895 $ 12,400