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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement of Comprehensive Income [Abstract]    
Net Income $ 68,314 $ 64,288
Other Comprehensive Income/(Loss), net of tax:    
Unrealized gains (losses) on securities 32,641 (153,860)
Reclassification adjustment for securities net change included in net income 18 15
Amortization of net unrealized gains on AFS securities transferred to HTM 1,477 436
Net unrealized gains (losses) on AFS investment securities 34,136 (153,409)
Net unrealized holding losses arising during the period (5,213) (31,376)
Reclassification adjustment for net change realized in net income 5,536 (1,506)
Net unrealized gains (losses) on interest rate derivatives used in cash flow hedges 323 (32,882)
Amortization of net unrecognized pension and postretirement items 25 25
Other Comprehensive Income (Loss) 34,484 (186,266)
Total Comprehensive Income (Loss) $ 102,798 $ (121,978)