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Accumulated Other Comprehensive Income (Loss) - Change in AOCI Components Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Period $ 1,414,242 $ 1,316,995
Total Other Comprehensive Income 13,107 29,360
Balance at End of Period 1,435,977 1,354,430
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)
Other Comprehensive Income (Loss) Before Reclassifications 8,380 24,195
Total Other Comprehensive Income 8,380 24,195
Balance at End of Period (216,027) (216,588)
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)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 4,558 5,081
Total Other Comprehensive Income 4,558 5,081
Balance at End of Period (144,463) (163,716)
Defined Benefit Plans    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Period (23,260) (25,078)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 169 84
Total Other Comprehensive Income 169 84
Balance at End of Period (23,091) (24,994)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Period (396,688) (434,658)
Other Comprehensive Income (Loss) Before Reclassifications 8,380 24,195
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 4,727 5,165
Total Other Comprehensive Income 13,107 29,360
Balance at End of Period $ (383,581) $ (405,298)