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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) loan item | Sep. 30, 2017 USD ($) loan | Sep. 30, 2016 USD ($) loan | Dec. 31, 2016 USD ($)
Pre-Modification Outstanding Recorded Investment |  | $ 3,365,000 | $ 2,666,000 | $ 1,909,000
Loans modified as troubled debt restructuring | $ 1,249,000 | $ 1,658,000 | $ 75,000 |
Number of loans modified as troubled debt restructuring | loan | 4 | 6 | 1 |
Credit relationships | item | 2 |  |  |
Real estate Residential |  |  |  |
Number of defaults on loans restructured |  |  | $ 2 |
Loans modified as troubled debt restructuring |  |  | $ 208,000 |

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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=84173941&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=84173941&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=84173941&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=82895541&loc=d3e18845-111554 + Details
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