Summary of Investment Securities with Unrealized Losses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 89,716	$ 119,824
Less Than 12 Months, Unrealized Losses	(1,012)	(1,867)
12 Months or Longer, Fair Value	4,729	5,734
12 Months or Longer, Unrealized Losses	(28)	(54)
Total, Fair Value	94,445	125,558
Total, Unrealized Losses	(1,040)	(1,921)
SBA loan pools securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	1,702	1,736
Less Than 12 Months, Unrealized Losses	(47)	(58)
Total, Fair Value	1,702	1,736
Total, Unrealized Losses	(47)	(58)
US government-sponsored entities and agency securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value		1,920
Less Than 12 Months, Unrealized Losses		(8)
Total, Fair Value		1,920
Total, Unrealized Losses		(8)
Private label residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	1,219	2,064
Less Than 12 Months, Unrealized Losses	(15)	(11)
12 Months or Longer, Fair Value	2,931	3,913
12 Months or Longer, Unrealized Losses	(14)	(25)
Total, Fair Value	4,150	5,977
Total, Unrealized Losses	(29)	(36)
Agency residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	86,795	114,104
Less Than 12 Months, Unrealized Losses	(950)	(1,790)
12 Months or Longer, Fair Value	1,798	1,821
12 Months or Longer, Unrealized Losses	(14)	(29)
Total, Fair Value	88,593	115,925
Total, Unrealized Losses	$ (964)	$ (1,819)