Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets
Total cash and cash equivalents	$ 31,721	$ 30,735	$ 20,447	$ 15,683
Other assets	24,832	26,279
Total assets	1,758,276	1,848,227
Liabilities
Subordinated debentures	32,486	32,331
Other liabilities	12,948	16,451
Stockholders' Equity	164,520	158,968	121,465	112,283
Total liabilities and stockholders' equity	1,758,276	1,848,227
Parent Company [Member]
Assets
Total cash and cash equivalents	16,807	13,639	8,262	8,496
Investment in Bank	181,808	180,880
Other assets	3,664	3,497
Total assets	202,279	198,016
Liabilities
Subordinated debentures	32,486	32,331
Other liabilities	5,273	6,717
Stockholders' Equity	164,520	158,968
Total liabilities and stockholders' equity	$ 202,279	$ 198,016