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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net Income $ 288,743 $ 284,280 $ 286,981
Unrealized gains (losses) on AFS investment securities:      
Net unrealized holding gains (losses) (22,425) 36,023 (312,169)
Reclassification adjustment for securities net change realized in net income 15,689 (567) (20)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 5,609 5,913 (44,483)
Net Unrealized Gains (Losses) on AFS Investment Securities (1,127) 41,369 (356,672)
Net unrealized holding gains (losses) 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
Net Unrealized Gains (Losses) on Interest Rate Derivatives Used in Cash Flow Hedges 18,731 26,993 (56,959)
Defined benefit pension plan and postretirement benefits:      
Unrecognized pension and postretirement income (cost) 7,279 4,777 644
Amortization of net unrecognized pension and postretirement income (loss) (422) 57 100
Net Unrealized Gains (Losses) on Defined Benefit Pension and Postretirement Plans 6,857 4,834 744
Other Comprehensive Income (Loss), Net of Tax 24,461 73,196 (412,887)
Total Comprehensive Income $ 313,204 $ 357,476 $ (125,906)