Income Taxes Effective Tax Rate (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
Tax-exempt income	(6.60%)	(6.50%)	(6.00%)
Tax credit investments	(7.80%)	(7.00%)	(5.20%)
Change in valuation allowance	1.20%	0.30%	(0.90%)
Bank owned life insurance	(0.40%)	(0.60%)	(0.60%)
Re-measurement of net deferred tax asset due to the Tax Act	6.70%	0.00%	0.00%
State income taxes, net of federal benefit	(0.50%)	1.20%	1.90%
Executive compensation	0.10%	0.10%	0.10%
Other, net	(1.00%)	(0.10%)	0.70%
Effective income tax rate	26.70%	22.40%	25.00%

Effective Income Tax Rate Reconciliation Bank Owned Life Insurance

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Effective Income Tax Rate Reconciliation Low Income Housing Investments

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 valuation allowance for deferred tax assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 740
-SubTopic 10
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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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