Income Taxes - Reconciliation of effective tax rate (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of effective tax rate
Statutory tax rate	21.00%	21.00%	35.00%
State taxes-net of federal tax effect	8.73%	8.56%	7.04%
Rate change - federal and state	0.00%	0.17%	9.36%
CRA investment tax credit	(4.93%)	(3.96%)	(3.50%)
Bank owned life insurance	(0.06%)	(0.20%)	(0.09%)
Tax exempt municipal bonds and loans	(0.22%)	(0.21%)	(0.45%)
Nondeductible transaction costs	0.00%	0.00%	(0.02%)
Changes in uncertain tax positions	(0.79%)	0.00%	0.00%
Other	0.71%	0.43%	(0.19%)
Effective income tax rate, percent	24.44%	25.79%	47.15%

Effective Income Tax Rate Reconciliation, Tax Credit, Bank Owned Life Insurance, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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