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Loans, net and allowance for loan losses - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 SecurityLoan	Sep. 30, 2013 SecurityLoan	Dec. 31, 2013
Receivables [Abstract]
Net deferred loan costs	$ 526,000		$ 526,000		$ 24,000
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	2,500,000	344,000	2,500,000	344,000	2,487,000
Number of new loans modified as troubled debt restructurings			1	0
Number of defaults on loans restructured	0	0	0	0
Loan modified as troubled debt restructing			$ 2,500,000

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- Definition

Deferred Loan Costs Net

+ References

No definition available.

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- Definition

Loans And Leases Receivable, Related Parties Impaired Nonperforming Nonaccrual Of Interest

+ References

No definition available.

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

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- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ 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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