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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Jun. 30, 2017 loan | Jun. 30, 2017 loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($)
Pre-Modification Outstanding Recorded Investment | $ |  |  |  |  | $ 3,230 | $ 3,365 | $ 3,074
Number of defaults on loans restructured | 0 |  | 0 | 0 |  |  |
Loans modified as troubled debt restructuring | $ |  |  |  |  |  | $ 1,658 |
Number of loans modified as troubled debt restructuring |  | 4 |  |  |  | 6 |
Credit relationships |  | 2 |  |  |  |  |
Real estate Commercial |  |  |  |  |  |  |
Loans modified as troubled debt restructuring | $ |  |  |  |  | $ 340 |  |
Number of loans modified as troubled debt restructuring |  |  |  |  | 1 |  |
Real estate Residential |  |  |  |  |  |  |
Number of defaults on loans restructured | 1 |  |  |  | 2 |  |
Real estate Residential |  |  |  |  |  |  |
Loans modified as troubled debt restructuring | $ | $ 6 | $ 1,249 |  |  | $ 64 |  |

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- Definition Represents the number of defaults on loans restructured. + References No definition available. + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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