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Accumulated Other Comprehensive (Loss) Income - Components of Other Comprehensive Income (Loss) (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 [Roll Forward]        
Beginning Balance $ 3,274,321 $ 2,757,679 $ 3,197,325 $ 2,760,139
OCI before reclassifications (5,313) (11,943) 6,220 (24,311)
Amounts reclassified from AOCI 3,849 19,474 7,260 23,267
Ending Balance 3,329,246 3,101,609 3,329,246 3,101,609
Unrealized Gains (Losses) on Investment Securities        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (264,890) (290,140) (275,989) (274,862)
OCI before reclassifications (5,357) (14,199) 4,412 (30,864)
Amounts reclassified from AOCI 0 15,688 2 15,688
Ending Balance (268,905) (287,248) (268,905) (287,248)
Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (10,773) (26,587) (16,052) (34,783)
OCI before reclassifications 44 2,256 1,808 6,553
Amounts reclassified from AOCI 3,955 3,891 7,470 7,790
Ending Balance (6,774) (20,440) (6,774) (20,440)
Unrecognized Pension and Postretirement Plan Income (Costs)        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance 4,116 (2,741) 4,222 (2,635)
OCI before reclassifications 0 0 0 0
Amounts reclassified from AOCI (106) (105) (212) (211)
Ending Balance 4,010 (2,846) 4,010 (2,846)
Total        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (271,547) (319,468) (287,819) (312,280)
Ending Balance (271,669) (310,534) (271,669) (310,534)
Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income [Roll Forward]        
Amounts reclassified from AOCI 1,342 1,403 2,670 2,790
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities        
Accumulated Other Comprehensive Income [Roll Forward]        
Amounts reclassified from AOCI 1,342 1,403 2,670 2,790
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