Affordable Housing Tax Credit Limited Partnership (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Affordable housing tax credit investment	$ 5,000		$ 5,000
Less amortization	537		492
Net affordable housing tax credit investment	4,463		4,508
Unfunded commitment	$ 3,151		$ 3,372
Funding period for unfunded commitment (in years)	11 years
Tax credits and other tax benefits recognized	$ 84	$ 56
Tax credit amortization expense included in provision for income taxes	$ 45	$ 56