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Loans, net and allowance for loan losses - Summary of Changes in Accretible Yield and Nonaccretible Difference of Acquired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Receivables [Abstract] |  |  |
Beginning Balance, Accretible |  |  |
Additions, Accretible | 934 |  |
Amortization, Accretible | (39) |  |
Charge-offs, Accretible |  |  |
Payments, Accretible |  |  |
Ending Balance, Accretible | 895 |  |
Beginning Balance, Nonaccretible |  | 211 | 229
Additions, Nonaccretible | 6,892 |  |
Amortization, Nonaccretible |  |  |
Charge-offs, Nonaccretible |  |  |
Payments, Nonaccretible |  | (211) | (18)
Ending Balance, Nonaccretible | $ 6,892 |  | $ 211

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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Nonaccretible Difference Additions + References No definition available. + Details
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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of additions to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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