Condensed Parent Company Only Financial Information - Condensed Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Income Statements, Captions [Line Items]
Total non-interest income		$ 6,549	$ 6,898	$ 8,619
Expenses
Other		6,839	9,521	9,649
Total expenses		23,204	28,106	27,208
Income (loss) before income taxes		245	(5,354)	(5,278)
Income tax benefit	$ 78	78	(762)	4,726
Net income (loss)		167	(4,592)	(10,004)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Distributed income of bank subsidiary		75
Undistributed income (loss) of bank subsidiary		247	(4,242)	(10,025)
Other loss		(32)	(208)	(53)
Total non-interest income		290	(4,450)	(10,078)
Expenses
Other		123	142	124
Total expenses		123	142	124
Income (loss) before income taxes		167	(4,592)	(10,202)
Income tax benefit				(198)
Net income (loss)		$ 167	$ (4,592)	$ (10,004)