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Other Comprehensive Income (Loss) - Schedule of Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Before-Tax Amount        
Net unrealized gains/losses / Other comprehensive (loss) income $ (10,164) $ (56,977) $ 17,443 $ (162,787)
Tax (Expense) Benefit        
Net unrealized gains/losses / Other comprehensive (loss) income 2,490 13,957 (4,274) 39,868
Net of Tax        
Change in net unrealized gain (loss) during the period (13,237) (43,449) 7,341 (123,854)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 5,563 429 5,828 935
Other comprehensive loss (7,674) (43,020) 13,169 (122,919)
Net unrealized gain/loss        
Before-Tax Amount        
Change in net unrealized gain (loss) during the period (17,531) (57,544) 9,724 (164,025)
Reclassification adjustment for net realized gain (loss) on sale of available-for-sale debt securities included in net income 7,052 0 7,052 0
Net unrealized gains/losses / Other comprehensive (loss) income (10,479) (57,544) 16,776 (164,025)
Tax (Expense) Benefit        
Change in net unrealized gain (loss) during the period 4,294 14,095 (2,383) 40,171
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (1,727) 0 (1,727) 0
Net unrealized gains/losses / Other comprehensive (loss) income 2,567 14,095 (4,110) 40,171
Net of Tax        
Change in net unrealized gain (loss) during the period (13,237) (43,449) 7,341 (123,854)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 5,325 0 5,325 0
Other comprehensive loss (7,912) (43,449) 12,666 (123,854)
Amortization of net retirement plan actuarial gain/loss        
Before-Tax Amount        
Reclassification adjustment for net realized gain (loss) on sale of available-for-sale debt securities included in net income 261 514 558 1,129
Tax (Expense) Benefit        
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (64) (125) (137) (276)
Net of Tax        
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 197 389 421 853
Amortization of net retirement plan prior service cost        
Before-Tax Amount        
Reclassification adjustment for net realized gain (loss) on sale of available-for-sale debt securities included in net income 54 53 109 109
Tax (Expense) Benefit        
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (13) (13) (27) (27)
Net of Tax        
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 41 40 82 82
Employee benefit plans        
Before-Tax Amount        
Net unrealized gains/losses / Other comprehensive (loss) income 315 567 667 1,238
Tax (Expense) Benefit        
Net unrealized gains/losses / Other comprehensive (loss) income (77) (138) (164) (303)
Net of Tax        
Other comprehensive loss $ 238 $ 429 $ 503 $ 935