Loans, Troubled Debt Restructuring (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) Loan	Jun. 30, 2016 USD ($) Loan	Jun. 30, 2017 USD ($) Loan	Jun. 30, 2016 USD ($) Loan
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans | Loan	0	2	2	5
Pre-Modification Recorded Balance	$ 0	$ 37,000	$ 32,000	$ 371,000
Post-Modification Recorded Balance	0	$ 37,000	$ 23,000	444,000
Troubled debt restructurings that subsequently defaulted within 12 months of the restructuring date	$ 1,236,000			$ 0
Commercial and industrial [Member]
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans | Loan	0	0	0	0
Pre-Modification Recorded Balance	$ 0	$ 0	$ 0	$ 0
Post-Modification Recorded Balance	$ 0	$ 0	$ 0	$ 0
Commercial, secured by real estate [Member]
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans | Loan	0	0	0	1
Pre-Modification Recorded Balance	$ 0	$ 0	$ 0	$ 299,000
Post-Modification Recorded Balance	$ 0	$ 0	$ 0	$ 372,000
Residential real estate [Member]
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans | Loan	0	1	1	2
Pre-Modification Recorded Balance	$ 0	$ 27,000	$ 18,000	$ 45,000
Post-Modification Recorded Balance	$ 0	$ 27,000	$ 9,000	$ 45,000
Consumer [Member]
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans | Loan	0	1	1	2
Pre-Modification Recorded Balance	$ 0	$ 10,000	$ 14,000	$ 27,000
Post-Modification Recorded Balance	$ 0	$ 10,000	$ 14,000	$ 27,000