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Loans, net and allowance for loan losses - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014 SecurityLoan	Jun. 30, 2013 SecurityLoan	Dec. 31, 2013
Receivables [Abstract]
Net deferred loan costs	$ 420		$ 24
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	1,900	346	2,487
Number of loans modified as troubled debt restructurings	0	0
Number of defaults on loans restructured	$ 0	$ 0

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- Definition

Deferred Loan Costs Net

+ References

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- 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=28368275&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=28368275&loc=SL6953682-111524

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