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Income Taxes (Details)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax [Abstract]
Federal statutory rate	21.00%	35.00%
Tax-exempt income on securities and loans	(1.80%)	(3.40%)
Tax-exempt BOLI income	(1.90%)	(3.50%)
State income tax, net of federal tax benefit	5.30%	4.40%
Tax credits	(2.20%)	(3.40%)
Other	0.10%	(0.50%)
Effective Income Tax Rate Reconciliation, Percent, Total	20.50%	28.60%

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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 income on bank owned life insurance.

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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 securities and loans.

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

+ References

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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 other adjustments.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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