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Loans, net and allowance for loan losses - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 USD ($) loan | Jun. 30, 2015 USD ($) loan | Jun. 30, 2016 USD ($) loan | Jun. 30, 2015 USD ($) loan | Dec. 31, 2015 USD ($)
Net deferred loan costs | $ 668 |  | $ 668 |  | $ 690
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk |  |  | 2,701 | $ 3,046 | 2,861
Number of defaults on loans restructured |  | $ 0 |  | 0 |
Loans modified as troubled debt restructuring |  | 170 | 75 | 554 |
Total impaired loans | $ 11,775 | $ 15,003 | $ 11,775 | $ 15,003 | 12,635
Number of loans modified as troubled debt restructuring | loan | 0 | 4 | 1 | 8 |
Real estate Residential |  |  |  |  |
Number of defaults on loans restructured |  |  | $ 0 |  |
Loans modified as troubled debt restructuring |  |  | 208 |  |
Total impaired loans | $ 3,220 | $ 4,440 | $ 3,220 | $ 4,440 | $ 4,966

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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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