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Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of 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
Before-Tax Amount        
Net unrealized gains/losses $ 15,124 $ 45,655 $ 46,293 $ 31,529
Tax (Expense) Benefit        
Net unrealized gains/losses and Other comprehensive income (loss) (3,782) (11,185) (11,574) (7,724)
Net of Tax        
Change in net unrealized (loss) gain during the period 11,235 34,300 34,396 23,221
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 107 170 323 584
Other comprehensive income (loss) 11,342 34,470 34,719 23,805
Net unrealized gains/losses        
Before-Tax Amount        
Change in net unrealized (loss) gain during the period 14,980 45,431 45,861 30,756
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 0 (50) 0 (50)
Net unrealized gains/losses 14,980 45,381 45,861 30,706
Tax (Expense) Benefit        
Change in net unrealized (loss) gain during the period (3,745) (11,131) (11,465) (7,535)
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 0 12 0 12
Net unrealized gains/losses and Other comprehensive income (loss) (3,745) (11,119) (11,465) (7,523)
Net of Tax        
Change in net unrealized (loss) gain during the period 11,235 34,300 34,396 23,221
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 0 (38) 0 (38)
Other comprehensive income (loss) 11,235 34,262 34,396 23,183
Amortization of net retirement plan actuarial gain (loss)        
Before-Tax Amount        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 95 229 285 686
Tax (Expense) Benefit        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) (24) (56) (72) (168)
Net of Tax        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 71 173 213 518
Amortization of net retirement plan prior service cost        
Before-Tax Amount        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 49 45 147 137
Tax (Expense) Benefit        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) (13) (10) (37) (33)
Net of Tax        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 36 35 110 104
Employee benefit plans        
Before-Tax Amount        
Net unrealized gains/losses 144 274 432 823
Tax (Expense) Benefit        
Net unrealized gains/losses and Other comprehensive income (loss) (37) (66) (109) (201)
Net of Tax        
Other comprehensive income (loss) $ 107 $ 208 $ 323 $ 622