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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) loan | Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) loan contract | Dec. 31, 2018 USD ($) loan contract
Loans in the formal process of foreclosure | $ 135,000 | $ 135,000 | $ 135,000 | $ 665,000 |
Number of loans modified |  | 4 | 4 | 1 | 1
Pre-Modification Outstanding Recorded Investment | 1,085,000 |  |  |  |
Post-Modification Outstanding Recorded Investment | 1,085,000 |  |  |  |
Recorded Investment | 1,051,000 | $ 1,051,000 | $ 1,051,000 |  |
Number of defaults on loans restructured | 0 |  |  | $ 0 | $ 0
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk | 2,818,000 | $ 2,818,000 | $ 2,818,000 | $ 2,193,000 |
COVID 19 |  |  |  |  |
Number of loans modified | loan |  | 4 |  |  |
COVID 19 | Restaurant |  |  |  |  |
Number of loans modified | loan |  | 2 |  |  |
COVID 19 | Retail, Small Business |  |  |  |  |
Number of loans modified | loan |  | 2 |  |  |
Commercial |  |  |  |  |
Number of loans modified | contract |  |  | 1 |  |
Pre-Modification Outstanding Recorded Investment | 12,000 |  |  |  |
Post-Modification Outstanding Recorded Investment | 12,000 |  |  |  |
Recorded Investment | 5,000 | $ 5,000 | $ 5,000 |  |
Real estate Commercial |  |  |  |  |
Number of loans modified | contract |  |  | 3 | 1 | 1
Pre-Modification Outstanding Recorded Investment | 1,073,000 |  |  | $ 346,000 | $ 340,000
Post-Modification Outstanding Recorded Investment | 1,073,000 |  |  | 346,000 | 340,000
Recorded Investment | $ 1,046,000 | $ 1,046,000 | $ 1,046,000 | $ 241,000 | $ 340,000

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- Definition Loans made to related parties which are considered nonaccrual, past due, restructured or a potential credit risk. + 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=121611835&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + 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=121611835&loc=SL6953676-111524 + Details
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