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Income Taxes - Reconciliation of effective tax rate (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Federal income tax, at statutory rate 21.00% 21.00% 35.00%
State taxes, net of Federal tax benefit 8.30% 7.80% 4.80%
Tax exempt investment security income, net (0.90%) (2.70%) (10.10%)
Bank owned life insurance, net (0.40%) (0.60%) (0.80%)
Compensation - Stock Compensation (0.20%) (0.60%) (2.80%)
Re-measurement resulting from Tax Act 0.00% 0.00% 14.80%
Change in uncertain tax positions 0.00% (0.30%) (0.90%)
Other 0.60% (0.90%) 1.10%
Effective tax rate 28.40% 23.70% 41.10%