Condensed Parent Company Only Financial Information - Condensed Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ (10,004)	$ (538)	$ 2,641
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Income) loss on other investments	64	(42)	84
Loss on impairment of other investments			360
Other liabilities	5,218	(1,122)	(211)
Net cash provided by operating activities	6,564	10,001	8,118
Cash flows from investing activities:
Net cash provided by investing activities	71,493	4,408	12,012
Cash flows from financing activities:
Retirement of stock		(181)
Dividends paid	(512)		(1,541)
Net cash used in financing activities	(90,765)	(32,165)	(3,039)
Net increase (decrease) in cash	(12,708)	(17,756)	17,091
Cash and cash equivalents, beginning of year	36,264	54,020	36,929
Cash and cash equivalents, end of year	23,556	36,264	54,020
Parent Company [Member]
Cash flows from operating activities:
Net income (loss)	(10,004)	(538)	2,641
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Income) loss on other investments	64	(42)	84
Loss on impairment of other investments			360
Undistributed (income) loss of unconsolidated subsidiaries	10,025	494	(1,845)
Other assets	25	164	(182)
Other liabilities	(161)		(1)
Net cash provided by operating activities	(51)	78	1,057
Cash flows from investing activities:
Redemption of equity securities	236	230	36
Net cash provided by investing activities	236	230	36
Cash flows from financing activities:
Retirement of stock		(181)
Dividends paid	(512)		(1,541)
Net cash used in financing activities	(512)	(181)	(1,541)
Net increase (decrease) in cash	(327)	127	(448)
Cash and cash equivalents, beginning of year	487	360	808
Cash and cash equivalents, end of year	$ 160	$ 487	$ 360