Securities - Aggregate Amortized Costs and Fair Values of Available-for-Sale Securities Portfolio (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 37,184	$ 39,721
Gross Unrealized Gains	192	129
Gross Unrealized (Losses)	(550)	(1,328)
Fair Value	36,826	38,522	[1]
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,984	1,736
Gross Unrealized Gains	10	9
Fair Value	1,994	1,745
US Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,057	9,383
Gross Unrealized Gains	11	11
Gross Unrealized (Losses)	(61)	(86)
Fair Value	10,007	9,308
State and Municipal Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,143	27,690
Gross Unrealized Gains	171	109
Gross Unrealized (Losses)	(489)	(1,242)
Fair Value	24,825	26,557
Auction Rate Security
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		912
Fair Value		$ 912

[1] Derived from the audited consolidated financial statements.