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Shareholders' Equity - Change in AOCI Components Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period $ 1,414,242 $ 1,316,995 $ 1,611,611
Other Comprehensive Income (Loss) 53,299 37,970 (368,276)
Balance at End of Period 1,667,774 1,414,242 1,316,995
Unrealized Gains and Losses on Net Investment Securities | Available-for-sale Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (224,407) (240,783) (32,940)
Other Comprehensive Income (Loss) Before Reclassifications 35,177 13,031 (384,543)
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity     176,700
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)   3,345  
Other Comprehensive Income (Loss) 35,177 16,376 (207,843)
Balance at End of Period (189,230) (224,407) (240,783)
Unrealized Gains and Losses on Net Investment Securities | Held-to-maturity Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (149,021) (168,797) 54
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity     (176,700)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 18,258 19,776 7,849
Other Comprehensive Income (Loss) 18,258 19,776 (168,851)
Balance at End of Period (130,763) (149,021) (168,797)
Defined Benefit Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (23,260) (25,078) (33,496)
Other Comprehensive Income (Loss) Before Reclassifications (810) 1,447 7,000
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 674 371 1,418
Other Comprehensive Income (Loss) (136) 1,818 8,418
Balance at End of Period (23,396) (23,260) (25,078)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (396,688) (434,658) (66,382)
Other Comprehensive Income (Loss) Before Reclassifications 34,367 14,478 (377,543)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 18,932 23,492 9,267
Other Comprehensive Income (Loss) 53,299 37,970 (368,276)
Balance at End of Period $ (343,389) $ (396,688) $ (434,658)