Fair Value Measurements - Fair Values and Unrealized Losses on 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]
Less than Twelve Months, Estimated fair value	$ 15,683	$ 4,937
Less than Twelve Months, Gross unrealized losses	(19)	(6)
Twelve Months or More, Estimated fair value
Twelve Months or More, Gross unrealized losses
Estimated fair value, Total	15,683	4,937
Gross unrealized losses, Total	(19)	(6)
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Estimated fair value	4,955	2,780
Less than Twelve Months, Gross unrealized losses	(6)	(4)
Twelve Months or More, Estimated fair value
Twelve Months or More, Gross unrealized losses
Estimated fair value, Total	4,955	2,780
Gross unrealized losses, Total	(6)	(4)
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Estimated fair value	10,728	2,157
Less than Twelve Months, Gross unrealized losses	(13)	(2)
Twelve Months or More, Estimated fair value
Twelve Months or More, Gross unrealized losses
Estimated fair value, Total	10,728	2,157
Gross unrealized losses, Total	(13)	(2)
U.S. Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Estimated fair value
Less than Twelve Months, Gross unrealized losses
Twelve Months or More, Estimated fair value
Twelve Months or More, Gross unrealized losses
Estimated fair value, Total
Gross unrealized losses, Total