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Shareholders' Equity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Before-Tax Amount      
Unrealized gain (loss) on securities $ (403,606) $ (23,222) $ 85,188
Reclassification adjustment for securities gains included in net income (27) (33,516) (3,053)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity (57,509) 3,485 4,360
Net unrealized holding gains (loss) arising during the period on interest rate derivatives used in cash flow hedges (81,400) (3,452)  
Reclassification adjustment for net loss (gain) realized in net income on interest rate derivatives used in cash flow hedges 7,761 (2,776)  
Unrecognized pension and postretirement income (cost) 825 9,147 (3,242)
Amortization of net unrecognized pension and postretirement income 128 1,480 1,311
Total Other Comprehensive Income (Loss) (533,828) (48,854) 84,564
Tax Effect      
Unrealized gain (loss) on securities 91,437 5,274 (19,537)
Reclassification adjustment for securities gains included in net income 7 7,611 694
Amortization of net unrealized losses on available for sale securities transferred to held to maturity 13,026 (795) (912)
Net unrealized holding gains (loss) arising during the period on interest rate derivatives used in cash flow hedges 18,437 782  
Reclassification adjustment for net loss (gain) realized in net income on interest rate derivatives used in cash flow hedges (1,757) 629  
Unrecognized pension and postretirement income (cost) (181) (2,003) 710
Amortization of net unrecognized pension and postretirement income (28) (324) (291)
Total Other Comprehensive Income (Loss) 120,941 11,174 (19,336)
Other Comprehensive Income/(Loss), net of tax:      
Unrealized gain (loss) on securities (312,169) (17,948) 65,651
Reclassification adjustment for securities gains included in net income (20) (25,905) (2,359)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity (44,483) 2,690 3,448
Net unrealized holding gains (losses) arising during the period (62,963) (2,670) 0
Reclassification adjustment for net loss (gain) realized in net income on interest rate derivatives used in cash flow hedges 6,004 (2,147) 0
Unrecognized pension and postretirement income (cost) 644 7,144 (2,532)
Amortization of net unrecognized pension and postretirement income 100 1,156 1,020
Total Other Comprehensive Income (Loss) $ (412,887) (37,680) $ 65,228
Accounting Standards Update 2019-04      
Before-Tax Amount      
Amortization of net unrealized losses on available for sale securities transferred to held to maturity   $ 3,700