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Loan Receivables and Allowance for Loan Losses - Total Troubled Debt Restructured Loans Included in Impaired Loans (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014 SecurityLoan	Dec. 31, 2013 SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans	3	2
Troubled debt restructured loan amount	$ 3,408,000	$ 2,188,000
Troubled debt restructured loan amount	1,800,000	1,891,000
Construction to Permanent [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		2
Troubled debt restructured loan amount		2,188,000
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	3
Troubled debt restructured loan amount	3,408,000
Troubled debt restructured loan amount	17,000	31,000
Accrual of Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	1
Troubled debt restructured loan amount	2,128,000	991,000
Accrual of Loans [Member] | Construction to Permanent [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		1
Troubled debt restructured loan amount		991,000
Accrual of Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2
Troubled debt restructured loan amount	2,128,000
Non-Accrual of Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1
Troubled debt restructured loan amount	1,280,000	1,197,000
Non-Accrual of Loans [Member] | Construction to Permanent [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		1
Troubled debt restructured loan amount		1,197,000
Non-Accrual of Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Troubled debt restructured loan amount	$ 1,280,000

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

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