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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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- Definition

Business Acquisition Cost Of Acquired Entity Cash Payable Percentage

+ References

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- Definition

Number Of Branches

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X

- Definition

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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X

- Definition

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

+ References

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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