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Income Taxes - Reconciliation of effective tax rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal income tax, at statutory rate	35.00%	35.00%	34.00%
State taxes, net of Federal tax benefit	4.80%	6.20%	4.10%
Tax exempt investment security income, net	(10.10%)	(10.30%)	(15.90%)
Bank owned life insurance, net	(0.80%)	(1.10%)	(2.50%)
Compensation - Stock Compensation	(2.80%)	(0.00%)	(0.00%)
Re-measurement resulting from Tax Act	14.80%	0.00%	0.00%
Change in uncertain tax positions	(0.90%)	0.10%	0.80%
Other	1.10%	1.40%	(1.40%)
Effective tax rate	41.10%	31.30%	19.10%

X

- Definition

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 changes in the income tax rates.

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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 life insurance expense.

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