Regulatory Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Jul. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount available for dividend distribution without prior approval from Regulatory Agency	12.8
Percentage of Bank's capital and surplus of which extensions of credit to a single affiliate are limited	10.00%
Percentage of Bank's capital and surplus of which extensions of credit to all affiliates are limited	20.00%
Basel III New Requirements [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital (to Risk - Weighted Assets) For Capital Adequacy, Ratio		6.00%
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, Ratio		8.00%
Tier 1 Capital (to Risk-Weighted Assets) To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio		8.00%
Total Capital (to Risk-Weighted Assets) To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio		10.00%
Common Equity Tier 1 Capital		4.50%
Common Equity Tier 1 Capital To Be Well-Capitalized Under Prompt Corrective Action		6.50%
Common Equity Tier 1 capital minimum buffer percent		2.50%
Minimum capital requirements effective date	Jan. 01, 2015
Capital conservation buffer requirement phase in period in years	3 years
Corporation [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital (to Risk - Weighted Assets) For Capital Adequacy, Ratio	4.00%
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, Ratio	8.00%
Tier 1 Capital (to Risk-Weighted Assets) To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio	6.00%
Total Capital (to Risk-Weighted Assets) To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital (to Risk - Weighted Assets) For Capital Adequacy, Ratio		4.00%
Tier 1 Capital (to Risk-Weighted Assets) To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio		6.00%

The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under 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 1H

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=35709795&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=35709795&loc=SL5958568-112826

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826

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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.

+ References

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)

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- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(e))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph e

-Article 4

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- Definition

The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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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.

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Capital conservation buffer requirement phase in period in years.

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- Definition

Common Equity Tier One Capital

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Common Equity Tier 1 capital minimum buffer percent. Under Basel III, a banking organization must hold a capital conservation buffer comprised of common equity Tier 1 capital above its minimum risk-based capital requirements in an amount greater than 2.5% of total risk-weighted asset.

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Common Equity Tier One Capital To Be Well Capitalized Under Prompt Corrective Action

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- Definition

Minimum Capital Requirements Effective Date

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- Definition

Percentage extension of credit to affiliates limited to capital and surplus.

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Percentage extension of credit to any one affiliate limited to capital and surplus.

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