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Loans, net and allowance for loan losses - Summary of Changes in Accretible Yield and Nonaccretible Difference of Acquired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Receivables [Abstract] |  |  |
Beginning Balance, Accretible | $ 60 | $ 895 |
Additions, Accretible |  |  | $ 934
Accretion, Accretible | (60) | (280) | (39)
Charge-offs, Accretible |  | (398) |
Payments, Accretible |  | (157) |
Ending Balance, Accretible |  | 60 | 895
Beginning Balance, Nonaccretible | 2,588 | 6,892 |
Additions, Nonaccretible |  |  | 6,892
Charge-offs, Nonaccretible |  | (2,703) |
Payments, Nonaccretible | (360) | (1,601) |
Ending Balance, Nonaccretible | $ 2,228 | $ 2,588 | $ 6,892

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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Charge Off + References No definition available. + Details
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- Definition Certain loans acquired in transfer not accounted for as debt securities accretible yield accretion. + References No definition available. + Details
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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Nonaccretible Difference + References No definition available. + Details
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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 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: 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 + 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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