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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) loan payment | Sep. 30, 2018 USD ($) loan payment | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) loan payment | Dec. 31, 2018 USD ($)
Number of loans modified | loan | 0 | 0 | 0 |  |
Pre-Modification Outstanding Recorded Investment |  |  | $ 2,262 | $ 3,230 | $ 2,779
Number of defaults on loans restructured | payment | 0 |  |  |  |
Real estate Commercial |  |  |  |  |
Number of loans modified | loan |  |  | 2 | 1 |
Number of defaults on loans restructured |  |  | $ 335 |  |
Loans modified as troubled debt restructuring |  |  |  | $ 340 |
Number of loans repaid | loan | 1 |  |  |  |
Loan repaid | $ 332 |  |  |  |
Real estate Residential |  |  |  |  |
Number of defaults on loans restructured | payment |  | 1 |  | 2 |
Loans modified as troubled debt restructuring |  | $ 6 |  | $ 64 |

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- Definition Represents the number of loans repaid. + References No definition available. + Details
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118936363&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=118939409&loc=d3e18845-111554 + Details
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