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Income Taxes - Reconciliation of Effective Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]                      
Income tax expense at Federal statutory rate                 $ 11,168 $ 17,020 $ 13,710
Tax-exempt instruments                 (1,785) (1,745) (1,879)
Non-deductible acquisition costs                 0 0 336
Federal tax credits and other benefits                 (1,928) (1,961) (515)
Effects of BOLI                 (827) (368) (330)
Tax benefit of CARES Act carryback                 (967) 0 0
Other, net                 949 542 (84)
Income tax expense $ 4,429 $ 2,477 $ (936) $ 640 $ 3,445 $ 3,621 $ 3,202 $ 3,220 $ 6,610 $ 13,488 $ 11,238