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Business - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		0 Months Ended
	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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Bank operated business financial centers, number.

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Bank operated commercial banking centers, number.

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Bank operated wealth management offices, number.

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Business Acquisition Cost Of Acquired Entity Cash Payable Percentage

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Number Of Branches

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Number of inactive subsidiaries.

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Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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-Name Accounting Standards Codification

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