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Business - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  | 0 Months Ended |
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Mar. 31, 2014 FinancialCenters Subsidiary | Feb. 18, 2014 American Security Bank [Member] Branch | Feb. 18, 2014 American Security Bank [Member] Electronic Branch [Member] Branch | Feb. 18, 2014 American Security Bank [Member] Loan Production Office [Member] Branch
Schedule Of Description Of Company [Line Items] |  |  |  |
Number of inactive subsidiaries | 3 |  |  |
Bank operated Business Financial Centers, number | 37 |  |  |
Bank operated Commercial Banking Centers, number | 6 |  |  |
Bank operated trust office, number | 3 |  |  |
Business acquisition transaction costs |  | $ 57 |  |
Cash payment percentage |  | 100.00% |  |
Total assets |  | $ 412 |  |
Number of branches |  | 5 | 2 | 1

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