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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net Income $ 100,454 $ 63,206 $ 292,639 $ 220,122
Other comprehensive income, net of tax:        
Net unrealized holding gains 38,606 68,560 43,018 37,696
Reclassification adjustment for securities net change realized in net income 0 1 2 15,689
Amortization of net unrealized gains on AFS investment securities transferred to HTM 1,330 1,422 4,000 4,212
Net Unrealized Gains on AFS Investment Securities 39,936 69,983 47,020 57,597
Net unrealized holding (losses) gains (289) (6,624) 1,519 (71)
Reclassification adjustment for net change realized in net income 4,586 3,979 12,056 11,769
Net Unrealized Gains (Losses) on Interest Rate Derivatives Used in Cash Flow Hedges 4,297 (2,645) 13,575 11,698
Amortization of net unrecognized pension and postretirement items (106) (106) (318) (317)
Other Comprehensive Income, Net of Tax 44,127 67,232 60,277 68,978
Total Comprehensive Income $ 144,581 $ 130,438 $ 352,916 $ 289,100