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Accumulated Other Comprehensive Income - Change in AOCI Components Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at Beginning of Period $ 1,704,935 $ 1,435,977 $ 1,667,774 $ 1,414,242
Other Comprehensive Income Before Reclassifications 14,646 4,427 35,221 12,807
Amounts Reclassified from Accumulated Other Comprehensive Income 4,557 4,793 8,974 9,520
Other Comprehensive Income 19,203 9,220 44,195 22,327
Balance at End of Period 1,743,107 1,612,849 1,743,107 1,612,849
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at Beginning of Period (318,397) (383,581) (343,389) (396,688)
Other Comprehensive Income 19,203 9,220 44,195 22,327
Balance at End of Period (299,194) (374,361) (299,194) (374,361)
Investment Securities-Available-for-Sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at Beginning of Period (168,655) (216,027) (189,230) (224,407)
Other Comprehensive Income Before Reclassifications 14,646 4,427 35,221 12,807
Amounts Reclassified from Accumulated Other Comprehensive Income 0 0 0 0
Other Comprehensive Income 14,646 4,427 35,221 12,807
Balance at End of Period (154,009) (211,600) (154,009) (211,600)
Investment Securities-Held-to-Maturity        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at Beginning of Period (126,578) (144,463) (130,763) (149,021)
Other Comprehensive Income Before Reclassifications 0 0 0 0
Amounts Reclassified from Accumulated Other Comprehensive Income 4,324 4,625 8,509 9,183
Other Comprehensive Income 4,324 4,625 8,509 9,183
Balance at End of Period (122,254) (139,838) (122,254) (139,838)
Defined Benefit Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at Beginning of Period (23,164) (23,091) (23,396) (23,260)
Other Comprehensive Income Before Reclassifications 0 0 0 0
Amounts Reclassified from Accumulated Other Comprehensive Income 233 168 465 337
Other Comprehensive Income 233 168 465 337
Balance at End of Period $ (22,931) $ (22,923) $ (22,931) $ (22,923)