Regulatory Capital - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Sep. 17, 2013 Maximum	Sep. 17, 2013 Repurchase Agreements
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Shares authorized to be repurchased			1,037,000
Shares authorized to be repurchased as percentage of total outstanding shares of common stock				5.00%
Shares available to be purchased under repurchase program	433,954
Equity restricted	$ 62.1	$ 58.4