Affordable Housing Tax Credit Limited Partnership (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Affordable housing tax credit investment	$ 3,000		$ 2,000
Less amortization	175		93
Net affordable housing tax credit investment	2,825		1,907
Unfunded commitment	$ 2,452		$ 1,617
Funding period for unfunded commitment (in years)	10 years
Tax credits and other tax benefits recognized	$ 79	$ 55
Tax credit amortization expense included in provision for income taxes	$ 82	$ 41