Foreclosed Real Estate - Summary of Foreclosed Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Real Estate [Abstract]
Balance at beginning of period	$ 11,641	$ 7,259	$ 8,796
Acquired through merger with NWGB		5,002
Transfers from loans	2,724	4,085	4,308
Capital improvements		171
Properties sold	(6,696)	(3,774)	(4,738)
Gain on sale of foreclosed assets	1,670	187	464
Transferred to loans	(1,548)	(785)	(1,239)
Write-downs and partial liquidations	(388)	(504)	(332)
Balance at end of period	$ 7,403	$ 11,641	$ 7,259