Foreclosed Real Estate - Summary of Foreclosed Real Estate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Real Estate [Abstract]
Balance at beginning of period	$ 9,902	$ 6,199	$ 11,641	$ 7,259
Acquired through merger with NWGB		5,002		5,002
Transfers from loans	460	1,057	2,636	2,284
Capital improvements		35		35
Property sold	(3,044)	(447)	(6,558)	(2,205)
Gain on sale of foreclosed assets	1,680	23	1,749	127
Transferred to loans		(194)	(259)	(785)
Write-downs and partial liquidations	(34)	(128)	(245)	(170)
Balance at end of period	$ 8,964	$ 11,547	$ 8,964	$ 11,547