Securities - Unrealized Loss Positions (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 16,932	$ 2,653
Less than 12 months, Unrealized Loss	(163)	(11)
12 months or more, Fair Value	4,900	12,538
12 months or more, Unrealized Loss	(53)	(188)
Fair Value, Total	21,832	15,191
Total Unrealized Loss	(216)	(199)
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value		742
Less than 12 months, Unrealized Loss		(2)
Fair Value, Total		742
Total Unrealized Loss		(2)
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	495
Less than 12 months, Unrealized Loss	(5)
Fair Value, Total	495
Total Unrealized Loss	(5)
US Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	13,871	1,499
Less than 12 months, Unrealized Loss	(141)	(4)
12 months or more, Fair Value	1,619	3,532
12 months or more, Unrealized Loss	(15)	(33)
Fair Value, Total	15,490	5,031
Total Unrealized Loss	(156)	(37)
State and Municipal Obligations
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	2,566	412
Less than 12 months, Unrealized Loss	(17)	(5)
12 months or more, Fair Value	3,281	9,006
12 months or more, Unrealized Loss	(38)	(155)
Fair Value, Total	5,847	9,418
Total Unrealized Loss	$ (55)	$ (160)