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Accumulated Other Comprehensive (Loss) Income - Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance $ 3,329,246 $ 3,101,609 $ 3,197,325 $ 2,760,139
OCI before reclassifications 38,317 61,936 44,537 37,625
Amounts reclassified from AOCI 4,480 3,874 11,740 27,141
Ending Balance 3,413,598 3,203,943 3,413,598 3,203,943
Unrealized Gains (Losses) on Investment Securities        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (268,905) (287,248) (275,989) (274,862)
OCI before reclassifications 38,606 68,560 43,018 37,696
Amounts reclassified from AOCI 0 1 2 15,689
Ending Balance (228,969) (217,265) (228,969) (217,265)
Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (6,774) (20,440) (16,052) (34,783)
OCI before reclassifications (289) (6,624) 1,519 (71)
Amounts reclassified from AOCI 4,586 3,979 12,056 11,769
Ending Balance (2,477) (23,085) (2,477) (23,085)
Unrecognized Pension and Postretirement Plan Income (Costs)        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance 4,010 (2,846) 4,222 (2,635)
OCI before reclassifications 0 0 0 0
Amounts reclassified from AOCI (106) (106) (318) (317)
Ending Balance 3,904 (2,952) 3,904 (2,952)
Total        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (271,669) (310,534) (287,819) (312,280)
Ending Balance (227,542) (243,302) (227,542) (243,302)
Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income [Roll Forward]        
Amounts reclassified from AOCI 1,330 1,422 4,000 4,212
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities        
Accumulated Other Comprehensive Income [Roll Forward]        
Amounts reclassified from AOCI 1,330 1,422 4,000 4,212
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges        
Accumulated Other Comprehensive Income [Roll Forward]        
Amounts reclassified from AOCI 0 0 0 0
Reclassification out of Accumulated Other Comprehensive Income | Unrecognized Pension and Postretirement Plan Income (Costs)        
Accumulated Other Comprehensive Income [Roll Forward]        
Amounts reclassified from AOCI $ 0 $ 0 $ 0 $ 0