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Other Comprehensive Income (Loss) - Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Before-Tax Amount      
Change in net unrealized gain (loss) during the period   $ 12,761  
Net unrealized gains/losses / Other comprehensive (loss) income $ 110,841 (202,310) $ (31,619)
Tax (Expense) Benefit      
Reclassification adjustment   (3,127)  
Other Comprehensive Income, Net unrealized losses (27,157) 49,571 7,743
Net of Tax      
Other comprehensive gain (loss), before reclassifications   9,634  
Other comprehensive (loss) income 83,684 (152,739) (23,876)
Available-for-sale securities      
Before-Tax Amount      
Change in net unrealized gain (loss) during the period 35,008 (229,463) (46,301)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 69,984 11,916 (275)
Net unrealized gains/losses / Other comprehensive (loss) income 104,992 (217,547) (46,576)
Tax (Expense) Benefit      
Other comprehensive gain (loss), before reclassifications (8,578) 56,223 11,340
Reclassification adjustment (17,146) (2,919) 67
Other Comprehensive Income, Net unrealized losses (25,724) 53,304 11,407
Net of Tax      
Other comprehensive gain (loss), before reclassifications 26,430 (173,240) (34,961)
Reclassification adjustment 52,838 8,997 (208)
Other comprehensive (loss) income 79,268 (164,243) (35,169)
Net retirement plan actuarial (loss) gain      
Before-Tax Amount      
Change in net unrealized gain (loss) during the period 4,516   11,785
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 1,116 2,260 2,951
Tax (Expense) Benefit      
Other comprehensive gain (loss), before reclassifications (1,106)   (2,887)
Reclassification adjustment (273) (554) (723)
Net of Tax      
Other comprehensive gain (loss), before reclassifications 3,410   8,898
Reclassification adjustment 843 1,706 2,228
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 217 216 221
Tax (Expense) Benefit      
Reclassification adjustment (54) (52) (54)
Net of Tax      
Reclassification adjustment 163 164 167
Employee benefit plans      
Before-Tax Amount      
Net unrealized gains/losses / Other comprehensive (loss) income 5,849 15,237 14,957
Tax (Expense) Benefit      
Other Comprehensive Income, Net unrealized losses (1,433) (3,733) (3,664)
Net of Tax      
Other comprehensive (loss) income $ 4,416 $ 11,504 $ 11,293