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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Before-Tax Amount    
Net unrealized gains/losses $ 27,607 $ (105,810)
Tax (Expense) Benefit    
Net unrealized gains/losses (6,764) 25,911
Net of Tax    
Other comprehensive income (loss) 20,843 (79,899)
Net unrealized gains/losses    
Before-Tax Amount    
Change in net unrealized gain (loss) during the period 27,255 (106,481)
Net unrealized gains/losses 27,255 (106,481)
Tax (Expense) Benefit    
Change in net unrealized gain (loss) during the period (6,677) 26,076
Net unrealized gains/losses (6,677) 26,076
Net of Tax    
Change in net unrealized gain (loss) during the period 20,578 (80,405)
Other comprehensive income (loss) 20,578 (80,405)
Amortization of net retirement plan actuarial gain    
Before-Tax Amount    
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 297 615
Tax (Expense) Benefit    
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (73) (151)
Net of Tax    
Net of tax 224 464
Amortization of net retirement plan prior service cost    
Before-Tax Amount    
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 55 56
Tax (Expense) Benefit    
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (14) (14)
Net of Tax    
Net of tax 41 42
Employee benefit plans    
Before-Tax Amount    
Net unrealized gains/losses 352 671
Tax (Expense) Benefit    
Net unrealized gains/losses (87) (165)
Net of Tax    
Other comprehensive income (loss) $ 265 $ 506