Investment Securities - Schedule of Unrealized Losses and Fair Value by Investment Category for Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014 Security	Dec. 31, 2013 Security
Schedule of Available-for-sale Securities [Line Items]
Count	61	108
Less than 12 Months Fair Value	$ 12,843	$ 35,215
Less than 12 Months Unrealized Losses	(81)	(816)
12 Months or Fair Value	8,650	298
More Unrealized Losses	(179)	(1)
Total Fair Value	21,493	35,513
Unrealized Losses	(260)	(817)
Obligations of other U.S. government agencies and corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Count	3	4
Less than 12 Months Fair Value	506	1,337
Less than 12 Months Unrealized Losses	(4)	(43)
12 Months or Fair Value	446
More Unrealized Losses	(21)
Total Fair Value	952	1,337
Unrealized Losses	(25)	(43)
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Count	33	47
Less than 12 Months Fair Value	10,210	18,764
Less than 12 Months Unrealized Losses	(42)	(220)
12 Months or Fair Value	2,577
More Unrealized Losses	(34)
Total Fair Value	12,787	18,764
Unrealized Losses	(76)	(220)
Obligations of state and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Count	19	49
Less than 12 Months Fair Value	604	11,818
Less than 12 Months Unrealized Losses	(2)	(495)
12 Months or Fair Value	5,080
More Unrealized Losses	(121)
Total Fair Value	5,684	11,818
Unrealized Losses	(123)	(495)
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Count	5	7
Less than 12 Months Fair Value	1,038	2,820
Less than 12 Months Unrealized Losses	(12)	(28)
12 Months or Fair Value	547	298
More Unrealized Losses	(3)	(1)
Total Fair Value	1,585	3,118
Unrealized Losses	(15)	(29)
Equity mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Count	1	1
Less than 12 Months Fair Value	485	476
Less than 12 Months Unrealized Losses	(21)	(30)
Total Fair Value	485	476
Unrealized Losses	$ (21)	$ (30)