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Other Comprehensive Income (Loss) - Schedule of Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Before-Tax Amount    
Net unrealized gains/losses / Other comprehensive (loss) income $ (9,391) $ 21,709
Tax (Expense) Benefit    
Other Comprehensive Income, Net unrealized loss 2,347 (5,427)
Net of Tax    
Other comprehensive gain (loss), before reclassifications (7,162) 16,117
Reclassification adjustment 118 165
Other comprehensive income (loss) (7,044) 16,282
Available-for-sale securities    
Before-Tax Amount    
Change in net unrealized (loss) gain during the period (9,549) 21,489
Net unrealized gains/losses / Other comprehensive (loss) income (9,549) 21,489
Tax (Expense) Benefit    
Change in net unrealized (loss) gain during the period 2,387 (5,372)
Other Comprehensive Income, Net unrealized loss 2,387 (5,372)
Net of Tax    
Other comprehensive gain (loss), before reclassifications (7,162) 16,117
Other comprehensive income (loss) (7,162) 16,117
Amortization of net retirement plan actuarial gain (loss)    
Before-Tax Amount    
Reclassification adjustment 109 171
Tax (Expense) Benefit    
Reclassification adjustment (27) (43)
Net of Tax    
Reclassification adjustment 82 128
Amortization of net retirement plan prior service cost    
Before-Tax Amount    
Reclassification adjustment 49 49
Tax (Expense) Benefit    
Reclassification adjustment (13) (12)
Net of Tax    
Reclassification adjustment 36 37
Employee benefit plans    
Before-Tax Amount    
Net unrealized gains/losses / Other comprehensive (loss) income 158 220
Tax (Expense) Benefit    
Other Comprehensive Income, Net unrealized loss (40) (55)
Net of Tax    
Other comprehensive income (loss) $ 118 $ 165