Condensed Parent Company Only Financial Information - Condensed Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings of unconsolidated bank subsidiary:
Loss on impairment of other investments			$ (360)
Other income	632	607	667
Total non-interest income	8,619	9,067	9,529
Expenses
Other	9,649	8,793	7,745
Total expenses	27,208	25,654	25,277
Income (loss) before income taxes	(5,278)	(2,739)	2,549
Income tax benefit	(4,726)	2,201	92
Net income (loss)	(10,004)	(538)	2,641
Parent Company [Member]
Earnings of unconsolidated bank subsidiary:
Distributed earnings			1,150
Undistributed earnings (loss)	(10,025)	(494)	1,845
Loss on impairment of other investments			(360)
Other income	(53)	57	(71)
Total non-interest income	(10,078)	(437)	2,564
Expenses
Other	124	122	105
Total expenses	124	122	105
Income (loss) before income taxes	(10,202)	(559)	2,459
Income tax benefit	(198)	(21)	(182)
Net income (loss)	$ (10,004)	$ (538)	$ 2,641