Securities Available for Sale - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014 Securities	Dec. 31, 2013 Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of Shareholders Equity	10.00%	10.00%
Number of securities holdings of any one issuer other than US Government greater than ten percent of shareholder's equity	0	0
Securities available for sale portfolio	80
Securities in unrealized loss position	67
Mortgage backed securities unrealized loss market value	$ 94,445	$ 125,558
Unrealized losses	1,040	1,921
Amount of rated securities portfolio	107,525	170,022
Private label residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Mortgage backed securities unrealized loss market value	4,150	5,977
Unrealized losses	29	36
Amount of rated securities portfolio	5,067	14,752
Agency residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Mortgage backed securities unrealized loss market value	88,593	115,925
Unrealized losses	964	1,819
AAA, AA or A
Schedule of Available-for-sale Securities [Line Items]
Amount of rated securities portfolio	107,300
BBB
Schedule of Available-for-sale Securities [Line Items]
Amount of rated securities portfolio	$ 231