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Shareholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Before-Tax Amount      
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax $ (28,993) $ 46,572 $ (403,606)
Reclassification adjustment for securities gains included in net income 20,283 (733) (27)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity 7,251 7,644 (57,509)
Net unrealized holding gains (losses) arising during the period on interest rate derivatives used in cash flow hedges 764 9,048 (81,400)
Reclassification adjustment for net gains (losses) realized in net income on interest rate derivatives used in cash flow hedges 23,453 25,850 7,761
Other comprehensive income, pension and other postretirement benefit plans, net unamortized gain (loss) arising during period, before tax 9,411 6,162 825
Amortization of net unrecognized pension and postretirement income (541) 73 128
Other Comprehensive Income (Loss), before Tax, Total 31,628 94,616 (533,828)
Tax Effect      
Net unrealized gains (losses) on securities 6,568 (10,549) 91,437
Reclassification adjustment for securities gains included in net income (4,594) 166 7
Amortization of net unrealized gains (losses) on AFS transferred to HTM (1,642) (1,731) 13,026
Net unrealized holding gains (losses) arising during the period on interest rate derivatives used in cash flow hedges (174) (2,050) 18,437
Reclassification adjustment for net gains (losses) realized in net income on interest rate derivatives used in cash flow hedges (5,312) (5,855) (1,757)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax (2,132) (1,385) (181)
Amortization of net unrecognized pension and postretirement income 119 (16) (28)
Other Comprehensive Income (Loss), Tax (7,167) (21,420) 120,941
Other comprehensive income (loss), net of tax:      
Net unrealized gains (losses) on securities (22,425) 36,023 (312,169)
Reclassification adjustment for securities gains (losses) included in net income 15,689 (567) (20)
Amortization of net unrealized gains (losses) on AFS transferred to HTM 5,609 5,913 (44,483)
Net unrealized holding gains (losses) arising during the period on interest rate derivatives used in cash flow hedges 590 6,998 (62,963)
Reclassification adjustment for net gains (losses) realized in net income on interest rate derivatives used in cash flow hedges 18,141 19,995 6,004
Unrecognized pension and postretirement income 7,279 4,777 644
Amortization of net unrecognized pension and postretirement items (422) 57 100
Total Other Comprehensive Income (Loss) $ 24,461 $ 73,196 $ (412,887)