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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Before-Tax Amount    
Net unrealized gains/losses / Other comprehensive (loss) income $ (12,997) $ 27,607
Tax (Expense) Benefit    
Other Comprehensive Income, Net unrealized losses 3,186 (6,764)
Net of Tax    
Other comprehensive (loss) income (9,811) 20,843
Net unrealized losses    
Before-Tax Amount    
Change in net unrealized (loss) gain during the period (13,284) 27,255
Net unrealized gains/losses / Other comprehensive (loss) income (13,284) 27,255
Tax (Expense) Benefit    
Change in net unrealized (loss) gain during the period 3,256 (6,677)
Other Comprehensive Income, Net unrealized losses 3,256 (6,677)
Net of Tax    
Other comprehensive gain (loss), before reclassifications (10,028) 20,578
Other comprehensive (loss) income (10,028) 20,578
Amortization of net retirement plan actuarial gain (loss)    
Before-Tax Amount    
Reclassification adjustment 242 297
Tax (Expense) Benefit    
Reclassification adjustment (59) (73)
Net of Tax    
Reclassification adjustment 183 224
Amortization of net retirement plan prior service cost    
Before-Tax Amount    
Reclassification adjustment 45 55
Tax (Expense) Benefit    
Reclassification adjustment (11) (14)
Net of Tax    
Reclassification adjustment 34 41
Employee benefit plans    
Before-Tax Amount    
Net unrealized gains/losses / Other comprehensive (loss) income 287 352
Tax (Expense) Benefit    
Other Comprehensive Income, Net unrealized losses (70) (87)
Net of Tax    
Other comprehensive (loss) income $ 217 $ 265