Regulatory and Capital Requirements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Schedule of Capitalization, Equity [Line Items]
Tier one risk-based capital to be well capitalized under prompt corrective action provision, ratio	6.00%
Risk-based capital to be well capitalized under prompt corrective action provision, ratio	10.00%
Tier one leverage capital to be well capitalized under prompt corrective action provision, ratio	5.00%
Common equity Tier 1 capital to risk-weighted assets ratio	4.50%
Common equity Tier 1 capital conservation buffer	2.50%
Ratio of Tier 1 capital to risk-weighted assets	9.70%	10.90%
Tier one leverage capital to be well capitalized, minimum leverage ratio	4.00%
Trust preferred securities assumed in acquisition	$ 142.3
Percent of trust preferred securities disallowed from Tier 1 capital treatment	75.00%
Trust preferred securities [Member]
Schedule of Capitalization, Equity [Line Items]
Tier one capital	$ 44.0	$ 186.3
Minimum [Member]
Schedule of Capitalization, Equity [Line Items]
Ratio of Tier 1 capital to risk-weighted assets	4.00%
Maximum [Member]
Schedule of Capitalization, Equity [Line Items]
Ratio of Tier 1 capital to risk-weighted assets	6.00%

The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826

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- Definition

The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

+ References

+ Details

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- Definition

The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

+ References

+ Details

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- Definition

Tier 1 capital divided by risk weighted assets as defined by regulations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1H

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826

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- Definition

Common Equity Tier One Capital To Risk Weighted Assets Basel Requirement

+ References

No definition available.

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- Definition

Minimum Leverage Tier One Capital Ratio To Be Considered Well Capitalized

+ References

No definition available.

+ Details

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- Definition

Tier One Capital Conservation Buffer to Risk Weighted Assets Required under Regulatory

+ References

No definition available.

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- Definition

This element represents trust preferred securities issued to capital trusts included in Tier 1 capital position.

+ References

No definition available.

+ Details

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- Definition

Percent of trust preferred securities disallowed from Tier 1 capital treatment based on the new final regulatory guidance.

+ References

No definition available.

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