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Loans, net and allowance for loan losses - Loan Modifications and Troubled Debt Restructurings (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) loan | Dec. 31, 2020 USD ($) contract
Loans in the formal process of foreclosure | $ 600,000 | $ 300,000 |  |  |
Number of loans | 0 | 0 |  | 4 | 4
Pre-Modification Recorded Investment |  |  | $ 1,085,000 |  |
Post-Modification 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 |  |
Interest income recognized using cash-basis method on impaired loan | 100,000 | 100,000 | 100,000 |  |
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk | $ 1,400,000 | $ 1,600,000 |  |  |
COVID 19 |  |  |  |  |
Number of loans | loan |  |  |  | 4 |
COVID 19 | Restaurant |  |  |  |  |
Number of loans | loan |  |  |  | 2 |
COVID 19 | Retail, Small Business |  |  |  |  |
Number of loans | loan |  |  |  | 2 |
Commercial | Commercial loans |  |  |  |  |
Number of loans | contract |  |  |  |  | 1
Pre-Modification Recorded Investment |  |  | 12,000 |  |
Post-Modification Recorded Investment |  |  | 12,000 |  |
Recorded Investment |  |  | 5,000 | $ 5,000 | $ 5,000
Commercial real estate |  |  |  |  |
Number of loans | contract |  |  |  |  | 3
Pre-Modification Recorded Investment |  |  | 1,073,000 |  |
Post-Modification Recorded Investment |  |  | 1,073,000 |  |
Recorded Investment |  |  | $ 1,046,000 | $ 1,046,000 | $ 1,046,000

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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 https://asc.fasb.org/extlink&oid=123577603&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 https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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