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Accumulated Other Comprehensive (Loss) Income - Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance $ 2,579,757 $ 2,712,680
OCI before reclassifications 32,641 (153,860)
Amounts reclassified from AOCI 366 (32,842)
Ending Balance 2,618,998 2,569,535
Unrealized Gains (Losses) on Investment Securities    
Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance (316,231) 40,441
OCI before reclassifications 32,641 (153,860)
Amounts reclassified from AOCI 18 15
Ending Balance (282,095) (112,968)
Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges    
Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance (61,776) (4,817)
OCI before reclassifications 0 0
Amounts reclassified from AOCI 323 (32,882)
Ending Balance (61,453) (37,699)
Unrecognized Pension and Postretirement Plan Income (Costs)    
Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance (7,469) (8,213)
OCI before reclassifications 0 0
Amounts reclassified from AOCI 25 25
Ending Balance (7,444) (8,188)
Total    
Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance (385,476) 27,411
Ending Balance (350,992) (158,855)
Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income [Roll Forward]    
Amounts reclassified from AOCI 1,477 436
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities    
Accumulated Other Comprehensive Income [Roll Forward]    
Amounts reclassified from AOCI 1,477 436
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
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