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Stockholders’ Equity and Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period $ 156,823 $ 138,241 $ 149,547 $ 136,085
Other comprehensive income (loss), before reclassifications     5,222 1,983
Amounts reclassified from accumulated other comprehensive income (loss)     0 0
Current period other comprehensive income (loss), before tax     5,222 1,983
Income tax (expense) benefit     (1,097) (416)
Current period other comprehensive income (loss), net of tax 3,571 5,038 4,125 1,567
Balance at end of period 164,938 146,474 164,938 146,474
Unrealized Gains (Losses) on Securities        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     (24,416) (21,461)
Other comprehensive income (loss), before reclassifications     6,179 2,501
Amounts reclassified from accumulated other comprehensive income (loss)     0 0
Current period other comprehensive income (loss), before tax     6,179 2,501
Income tax (expense) benefit     (1,298) (525)
Current period other comprehensive income (loss), net of tax     4,881 1,976
Balance at end of period (19,535) (19,485) (19,535) (19,485)
Unrecognized Net Pension and Postretirement (Income) Costs        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     11,973 7,699
Other comprehensive income (loss), before reclassifications     (957) (518)
Amounts reclassified from accumulated other comprehensive income (loss)     0 0
Current period other comprehensive income (loss), before tax     (957) (518)
Income tax (expense) benefit     201 109
Current period other comprehensive income (loss), net of tax     (756) (409)
Balance at end of period 11,217 7,290 11,217 7,290
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period (11,889) (17,233) (12,443) (13,762)
Current period other comprehensive income (loss), net of tax 3,571 5,038 4,125 1,567
Balance at end of period $ (8,318) $ (12,195) $ (8,318) $ (12,195)