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Loans, net and allowance for loan losses - Additional Information (Detail)				3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) SecurityLoan	Jun. 30, 2014 USD ($) SecurityLoan	Jun. 30, 2015 USD ($) SecurityLoan	Jun. 30, 2014 USD ($) SecurityLoan
Receivables [Abstract]
Net deferred loan costs	$ 700,000	$ 651,000		$ 700,000		$ 700,000
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	$ 3,046,000	$ 2,933,000	$ 1,900,000
Number of loans modified as troubled debt restructuring | SecurityLoan				4	0	8	0
Number of defaults on loans restructured				$ 0	$ 0	$ 0	$ 0
Loans modified as troubled debt restructuring				$ 170,000		$ 554,000

X

- Definition

Deferred Loan Costs Net

+ References

No definition available.

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- Definition

Pre-modification amount of investment in financing receivables 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=49124121&loc=SL6953676-111524

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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=49124121&loc=SL6953682-111524

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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=49124121&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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