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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Before-Tax Amount    
Net unrealized gains/losses / Other comprehensive (loss) income $ 21,709 $ (12,997)
Tax (Expense) Benefit    
Other Comprehensive Income, Net unrealized losses (5,427) 3,186
Net of Tax    
Other comprehensive gain (loss), before reclassifications 16,117 (10,028)
Reclassification adjustment 165 217
Other comprehensive income (loss) 16,282 (9,811)
Net unrealized gains (losses)    
Before-Tax Amount    
Change in net unrealized (loss) gain during the period 21,489 (13,284)
Net unrealized gains/losses / Other comprehensive (loss) income 21,489 (13,284)
Tax (Expense) Benefit    
Change in net unrealized (loss) gain during the period (5,372) 3,256
Other Comprehensive Income, Net unrealized losses (5,372) 3,256
Net of Tax    
Other comprehensive gain (loss), before reclassifications 16,117 (10,028)
Other comprehensive income (loss) 16,117 (10,028)
Amortization of net retirement plan actuarial gain (loss)    
Before-Tax Amount    
Reclassification adjustment 171 242
Tax (Expense) Benefit    
Reclassification adjustment (43) (59)
Net of Tax    
Reclassification adjustment 128 183
Amortization of net retirement plan prior service cost    
Before-Tax Amount    
Reclassification adjustment 49 45
Tax (Expense) Benefit    
Reclassification adjustment (12) (11)
Net of Tax    
Reclassification adjustment 37 34
Employee benefit plans    
Before-Tax Amount    
Net unrealized gains/losses / Other comprehensive (loss) income 220 287
Tax (Expense) Benefit    
Other Comprehensive Income, Net unrealized losses (55) (70)
Net of Tax    
Other comprehensive income (loss) $ 165 $ 217