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Shareholders' Equity - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning Balance $ (312,280)    
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 5,609 $ 5,913 $ (44,483)
Ending Balance (287,819) (312,280)  
Unrealized Gains (Losses) on Investment Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning Balance (274,862) (316,231) 40,441
OCI before reclassifications (22,425) 36,023 (312,169)
Amounts reclassified from AOCI 15,689 (567) (20)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 5,609 5,913 (44,483)
Ending Balance (275,989) (274,862) (316,231)
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 (34,783) (61,776) (4,817)
OCI before reclassifications 590 6,998 (62,963)
Amounts reclassified from AOCI 18,141 19,995 6,004
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 0 0 0
Ending Balance (16,052) (34,783) (61,776)
Unrecognized Pension and Postretirement Plan Income (Costs)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning Balance (2,635) (7,469) (8,213)
OCI before reclassifications 7,279 4,777 644
Amounts reclassified from AOCI (422) 57 100
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 0 0 0
Ending Balance 4,222 (2,635) (7,469)
Accumulated Other Comprehensive (Loss) Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning Balance (312,280) (385,476) 27,411
OCI before reclassifications (14,556) 47,798 (374,488)
Amounts reclassified from AOCI 33,408 19,485 6,084
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 5,609 5,913 (44,483)
Ending Balance $ (287,819) $ (312,280) $ (385,476)