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Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net of tax      
Balance $ 2,486,066,000 $ 2,269,005,000 $ 2,656,912,000
Other comprehensive income (loss) 66,216,000 109,044,000 (517,561,000)
Balance 2,617,486,000 2,486,066,000 2,269,005,000
Incremental non-credit-related impairment loss recognized in earnings on securities 0 0 0
Accumulated Other Comprehensive (Loss) Income      
Net of tax      
Balance (530,210,000) (639,254,000) (121,693,000)
Other comprehensive income (loss) 66,216,000 109,044,000 (517,561,000)
Balance (463,994,000) (530,210,000) (639,254,000)
Pensions and Other Benefits      
Net of tax      
Balance (5,373,000) (5,431,000) (24,390,000)
Other comprehensive income (loss) 3,494,000 58,000 18,959,000
Balance (1,879,000) (5,373,000) (5,431,000)
Investment securities      
Net of tax      
Other comprehensive income (loss) 62,004,000 105,087,000  
Available-for-sale Investment securities      
Net of tax      
Balance (222,423,000) (292,175,000) (97,303,000)
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity     372,419,000
Other comprehensive income (loss) 28,894,000 69,752,000 (567,291,000)
Balance (193,529,000) (222,423,000) (292,175,000)
Held-to-Maturity Investment Securities      
Net of tax      
Balance (301,611,000) (336,946,000)  
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity     (372,419,000)
Other comprehensive income (loss) 33,110,000 35,335,000 35,473,000
Balance (268,501,000) (301,611,000) (336,946,000)
Cash Flow Derivative Hedges      
Net of tax      
Balance (803,000) (4,702,000)  
Other comprehensive income (loss) 718,000 3,899,000 (4,702,000)
Balance $ (85,000) $ (803,000) $ (4,702,000)