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Accumulated Other Comprehensive Income (Loss) - Changes in Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity [Abstract]        
Unrealized gain on securities, before tax amount $ 24,968 $ 44,199 $ (26,783) $ 66,581
Unrealized gain on securities, tax effect (5,670) (9,775) 6,082 (14,728)
Unrealized gain on securities, net of tax amount 19,298 34,424 (20,701) 51,853
Reclassification adjustment for securities gains included in net income, before tax amount (36) (3,005) 451 (3,051)
Reclassification adjustment for securities gains included in net income, tax effect 8 664 (102) 675
Reclassification adjustment for securities gains included in net income, net of tax amount (28) (2,341) 349 (2,376)
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 (349) 1,019 1,963 2,040
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 79 (226) (446) (451)
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 (270) 793 1,517 1,589
Net unrealized gain on interest rate swaps used in cash flow hedges, before-tax amount 2,683   474  
Net unrealized gain on interest rate swaps used in cash flow hedges, tax 609   107  
Net unrealized gain on interest rate swaps used in cash flow hedges, net of tax amount 2,074   367  
Amortization of net unrecognized pension and postretirement items, before tax amount 370 328 740 656
Amortization of net unrecognized pension and postretirement items, tax effect (81) (73) (162) (146)
Amortization of net unrecognized pension and postretirement items, net of tax amount 289 255 578 510
Total Other Comprehensive Income, Before Tax Amount 27,636 42,541 (23,155) 66,226
Total Other Comprehensive Income, Tax Effect (6,273) (9,410) 5,265 (14,650)
Other Comprehensive Income (Loss) $ 21,363 $ 33,131 $ (17,890) $ 51,576