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Other Comprehensive Income (Loss) - Schedule of Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Before-Tax Amount        
Net unrealized gains/losses $ 45,655 $ 25,815 $ 31,529 $ 43,258
Tax (Expense) Benefit        
Net unrealized gains/losses and Other comprehensive (loss) income (11,185) (6,324) (7,724) (10,598)
Net of Tax        
Change in net unrealized (loss) gain during the period 34,300 (28,273) 23,221 (20,932)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (loss) 170 47,764 584 53,592
Other comprehensive income 34,470 19,491 23,805 32,660
Net unrealized gains/losses        
Before-Tax Amount        
Change in net unrealized (loss) gain during the period 45,431 (37,449) 30,756 (27,725)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (loss) (50) 62,932 (50) 69,984
Net unrealized gains/losses 45,381 25,483 30,706 42,259
Tax (Expense) Benefit        
Change in net unrealized (loss) gain during the period (11,131) 9,176 (7,535) 6,793
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (loss) 12 (15,419) 12 (17,146)
Net unrealized gains/losses and Other comprehensive (loss) income (11,119) (6,243) (7,523) (10,353)
Net of Tax        
Change in net unrealized (loss) gain during the period 34,300 (28,273) 23,221 (20,932)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (loss) (38) 47,513 (38) 52,838
Other comprehensive income 34,262 19,240 23,183 31,906
Amortization of net retirement plan actuarial gain (loss)        
Before-Tax Amount        
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (loss) 229 279 686 837
Tax (Expense) Benefit        
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (loss) (56) (68) (168) (205)
Net of Tax        
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (loss) 173 211 518 632
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 (loss) 45 53 137 162
Tax (Expense) Benefit        
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (loss) (10) (13) (33) (40)
Net of Tax        
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income (loss) 35 40 104 122
Employee benefit plans        
Before-Tax Amount        
Net unrealized gains/losses 274 332 823 999
Tax (Expense) Benefit        
Net unrealized gains/losses and Other comprehensive (loss) income (66) (81) (201) (245)
Net of Tax        
Other comprehensive income $ 208 $ 251 $ 622 $ 754