Fair Value Measurements - Summary of Company's Securities Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 67,628	$ 50,355
Gross unrealized gains	133	859
Gross unrealized losses	(19)	(6)
Securities available-for-sale, Estimated fair value	67,742	51,208
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	16,049	17,941
Gross unrealized gains	9	10
Gross unrealized losses	(6)	(4)
Securities available-for-sale, Estimated fair value	16,052	17,947
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	51,579	2,159
Gross unrealized gains	124
Gross unrealized losses	(13)	(2)
Securities available-for-sale, Estimated fair value	51,690	2,157
U.S. Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		30,255
Gross unrealized gains		849
Gross unrealized losses
Securities available-for-sale, Estimated fair value		$ 31,104