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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net Income $ 72,097 $ 70,871 $ 220,017 $ 205,148
Other Comprehensive Income/(Loss), net of tax:        
Net unrealized holding (losses) (105,050) (120,385) (103,628) (362,596)
Reclassification adjustment for securities net change realized in net income 0 (41) 14 (20)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM 1,494 1,653 4,473 (46,024)
Net unrealized (losses) on AFS investment securities (103,556) (118,773) (99,141) (408,640)
Net unrealized holding gains (losses) 3,651 (22,472) (8,755) (62,434)
Reclassification adjustment for net change realized in net income 6,420 2,483 20,573 641
Net unrealized gains (losses) on interest rate derivatives used in cash flow hedges 10,071 (19,989) 11,818 (61,793)
Amortization of net unrecognized pension and postretirement items 15 25 43 75
Other Comprehensive Loss (93,470) (138,737) (87,280) (470,358)
Total Comprehensive Income (Loss) $ (21,373) $ (67,866) $ 132,737 $ (265,210)