Loans Loans, Troubled Debt Restructuring, Modification Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	$ 0	$ 23
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Commercial, secured by real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	9
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	14
Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	14
Term Modification [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Term Modification [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Term Modification [Member] | Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Term Modification [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	14
Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Rate Modification [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Rate Modification [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Rate Modification [Member] | Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Rate Modification [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Interest Only [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Interest Only [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Interest Only [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Interest Only [Member] | Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Interest Only [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	9
Principal Forgiveness [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Principal Forgiveness [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Principal Forgiveness [Member] | Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	9
Principal Forgiveness [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Combination [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Combination [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Combination [Member] | Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	0	0
Combination [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Balance	$ 0	$ 0