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Accumulated Other Comprehensive Income Changes in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Equity [Abstract]    
Unrealized gain on securities, before tax amount $ (51,751) $ 22,380
Unrealized gain on securities, tax effect 11,753 (4,949)
Unrealized gain on securities, net of tax amount (39,999) 17,431
Reclassification adjustment for securities gains included in net income, before tax amount 487 (46)
Reclassification adjustment for securities gains included in net income, tax effect (110) 10
Reclassification adjustment for securities gains included in net income, net of tax amount 377 (36)
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To-Maturity, Before Tax 2,312 1,022
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To-Maturity, Tax (525) (227)
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To Maturity, After Tax 1,787 795
Net unrealized loss on interest rate swaps used in cash flow hedges, before-tax amount (2,209)  
Net unrealized loss on interest rate swaps used in cash flow hedges, tax (502)  
Net unrealized loss on interest rate swaps used in cash flow hedges, net of tax amount (1,707)  
Amortization of net unrecognized pension and postretirement items, before tax amount 370 328
Amortization of net unrecognized pension and postretirement items, tax effect (81) (73)
Amortization of net unrecognized pension and postretirement items, net of tax amount 289 255
Total Other Comprehensive Income, Before Tax Amount (50,791) 23,684
Total Other Comprehensive Income, Tax Effect 11,538 (5,239)
Other Comprehensive (Loss) Income $ (39,253) $ 18,445