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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 Loans And Leases Receivable, Related Parties Impaired Nonperforming Nonaccrual Of Interest + References No definition available. + 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=35738203&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=35738203&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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