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Income Taxes - Income Tax Reconciliation (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
Effective Income Tax Rate Reconciliation, Amount                      
Income before provision for income tax expense                 $ 17,476 $ 19,937 $ 12,382
Tax at statutory federal income tax rate                 3,670 4,187 2,600
Tax Cuts and Jobs Act                     (343)
State restructuring                     (143)
Tax-exempt income, net                 (487) (408) (432)
Other, net                   44 (14)
Income Tax Expense (Benefit), Total $ 1,123 $ 1,153 $ 750 $ 157 $ 941 $ 954 $ 837 $ 1,091 $ 3,183 $ 3,823 $ 1,668
Effective Income Tax Rate Reconciliation, Percent                      
Income tax rate without impact of Tax Cuts and Jobs Act (as a percent)                 21.00% 21.00% 21.00%
Tax Cuts and Jobs Act (as a percent)                     (2.77%)
State restructuring (as a percent)                     (1.16%)
Tax-exempt income, net (as a percent)                 (2.79%) (2.04%) (3.49%)
Other, net (as a percent)                   0.22% (0.11%)
Provision for income tax expense (as a percent)                 18.21% 19.18% 13.47%