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Income Taxes - Reconciliation of effective tax rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of effective tax rate
Statutory tax rate	21.00%	35.00%	35.00%
State taxes-net of federal tax effect	8.56%	7.04%	7.28%
Rate change - federal and state	0.17%	9.36%	0.00%
CRA investment tax credit	(3.96%)	(3.50%)	(2.40%)
Bank owned life insurance	(0.20%)	(0.09%)	(0.26%)
Tax exempt municipal bonds and loans	(0.21%)	(0.45%)	(0.22%)
Nondeductible transaction costs	0.00%	(0.02%)	0.80%
Other	0.43%	(0.19%)	0.31%
Effective income tax rate, percent	25.79%	47.15%	40.51%

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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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