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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 |

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- Definition Deferred Loan Costs Net + References No definition available. + Details
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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 + Details
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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 + Details
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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=49124121&loc=SL6953682-111524 + Details
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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 + Details
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