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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net Income $ 75,583 $ 61,611 $ 213,611 $ 127,213
Other Comprehensive (Loss)/Income, net of tax:        
Unrealized (loss)/gain on securities (21,622) 4,333 (16,073) 56,186
Reclassification adjustment for securities gains included in net income 0 (1) (25,901) (2,377)
Amortization of net unrealized losses on AFS securities transferred to HTM 637 928 2,154 2,517
Net unrealized gain on interest rate swaps used in cash flow hedges (891) 0 (524) 0
Amortization of net unrecognized pension and postretirement income 290 255 868 765
Other Comprehensive (Loss)/Income (21,586) 5,515 (39,476) 57,091
Total Comprehensive Income $ 53,997 $ 67,126 $ 174,135 $ 184,304