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Shareholders' Equity - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning Balance $ (385,476)    
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 5,913 $ (44,483) $ 2,690
Ending Balance (312,280) (385,476)  
Unrealized Gains (Losses) on Investment Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning Balance (316,231) 40,441 81,604
OCI before reclassifications 36,023 (312,169) (17,948)
Amounts reclassified from AOCI gain (loss) (567) (20) (25,905)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 5,913 (44,483) 2,690
Ending Balance (274,862) (316,231) 40,441
Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning Balance (61,776) (4,817) 0
OCI before reclassifications 6,998 (62,963) 0
Amounts reclassified from AOCI gain (loss) 19,995 6,004 (4,817)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 0 0 0
Ending Balance (34,783) (61,776) (4,817)
Unrecognized Pension and Postretirement Plan Income (Costs)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning Balance (7,469) (8,213) (16,513)
OCI before reclassifications 4,777 644 7,144
Amounts reclassified from AOCI gain (loss) 57 100 1,156
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 0 0 0
Ending Balance (2,635) (7,469) (8,213)
Accumulated Other Comprehensive (Loss) Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning Balance (385,476) 27,411 65,091
OCI before reclassifications 47,798 (374,488) (10,804)
Amounts reclassified from AOCI gain (loss) 19,485 6,084 (29,566)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 5,913 (44,483) 2,690
Ending Balance $ (312,280) $ (385,476) $ 27,411