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Loans, net and allowance for loan losses - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Loans SecurityLoan | Dec. 31, 2012 SecurityLoan Loans | Dec. 31, 2011
Receivables [Abstract] |  |  |
Net deferred loan costs | $ 24 |  |
Loans outstanding to directors, executive officers, principal stockholders or to their affiliates | 15,513 | 14,205 |
Advances and repayments of loans receivable | 12,429 | 13,737 |
Interest income recognized using the cash-basis method on impaired loans | 0 | 0 | 0
Number of distressed loans | 29 | 29 |
Credit adjustment on distressed loans | 7,787 | 7,826 |
Total impaired loans | 14,274 | 5,271 | 3,534
Impaired loans acquired | 7,391 |  |
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk | 2,487 | 351 | 368
Number of loans modified as troubled debt restructurings | 0 | 0 |
Amount of defaults on loans considered troubled debt restructurings | 0 | 0 |
Amount charge-offs as a result of the troubled debt restructurings | $ 0 |  |

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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=28368275&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=28368275&loc=SL6953682-111524 + Details
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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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