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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 9,315 $ 7,084 $ 22,711 $ 15,850
Other comprehensive (loss) income, before tax:        
Accumulated postretirement (benefit) expense obligation adjustment 0 (7) 0 127
Net unrealized gains (losses) on investments arising during the period 1,171 (1,250) 501 (1,547)
Reclassification adjustment for write-down of securities included in net income 0 96 74 208
Other comprehensive income (loss), before income tax 1,171 (1,161) 575 (1,212)
Income tax (benefit) expense related to postretirement health benefits 0 (1) 0 27
Income tax expense (benefit) related to net unrealized gains (losses) on investments arising during the period 251 (266) 107 (332)
Income tax expense related to reclassification adjustment for write-down of securities included in net income 0 22 18 48
Net income tax expense (benefit) on other comprehensive income (loss) 251 (245) 125 (257)
Other comprehensive income (loss), net of tax 920 (916) 450 (955)
Comprehensive Income $ 10,235 $ 6,168 $ 23,161 $ 14,895