Securities - Summary of Securities that had Unrealized Losses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	$ 108,258	$ 45,553
Less than 12 Months, Aggregate Losses	(7,690)	(338)
Twelve Months or Longer, Fair Value	35,909	0
Twelve Months or Longer, Unrealized Losses	(961)	0
Total, Fair Value	144,167	45,553
Total, Unrealized Losses	(8,651)	(338)
U.S. Government agencies and corporations
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	65,388	0
Less than 12 Months, Aggregate Losses	(6,463)	0
Twelve Months or Longer, Fair Value	0	0
Twelve Months or Longer, Unrealized Losses	0	0
Total, Fair Value	65,388	0
Total, Unrealized Losses	(6,463)	0
Mortgage backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	28,603	44,491
Less than 12 Months, Aggregate Losses	(566)	(328)
Twelve Months or Longer, Fair Value	31,051	0
Twelve Months or Longer, Unrealized Losses	(679)	0
Total, Fair Value	59,654	44,491
Total, Unrealized Losses	(1,245)	(328)
Collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	5,079
Less than 12 Months, Aggregate Losses	(59)
Twelve Months or Longer, Fair Value	4,411
Twelve Months or Longer, Unrealized Losses	(191)
Total, Fair Value	9,490
Total, Unrealized Losses	(250)
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	9,188	1,062
Less than 12 Months, Aggregate Losses	(602)	(10)
Twelve Months or Longer, Fair Value	447	0
Twelve Months or Longer, Unrealized Losses	(91)	0
Total, Fair Value	9,635	1,062
Total, Unrealized Losses	$ (693)	$ (10)