Securities - Aggregate Amortized Costs and Fair Values of Available-for-Sale Securities Portfolio (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 47,254	$ 42,536
Gross Unrealized Gains	177	267
Gross Unrealized (Losses)	(375)	(199)
Fair Value	47,056	42,604	[1]
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,232	2,232
Gross Unrealized Gains	10	8
Gross Unrealized (Losses)		(2)
Fair Value	2,242	2,238
US Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,375	16,969
Gross Unrealized Gains	67	33
Gross Unrealized (Losses)	(69)	(37)
Fair Value	21,373	16,965
State and Municipal Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,447	23,335
Gross Unrealized Gains	100	226
Gross Unrealized (Losses)	(306)	(160)
Fair Value	23,241	$ 23,401
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	200
Fair Value	$ 200

[1] Derived from the audited consolidated financial statements.