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Subsequent Events - Additional Information (Detail) (American Security Bank [Member], USD $) In Millions, unless otherwise specified |  | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Feb. 18, 2014 Subsequent Event [Member] Branch | Feb. 18, 2014 Subsequent Event [Member] Electronic Branch [Member] Branch
Business acquisition transaction costs |  | $ 57 |
Cash payment percentage |  | 100.00% |
Total assets | $ 412 |  |
Number of branches |  | 5 | 2

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