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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 loan | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) loan | Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) loan contract
Loans in the formal process of foreclosure |  | $ 285,000 | $ 135,000 | $ 135,000 | $ 135,000 |
Number of loans |  | 0 |  | 4 | 4 | 1
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
Loan Receivable Balances Where Payment Deferrals Were Granted |  |  | 330,119,000 | 330,119,000 | 330,119,000 |
Interest income recognized using cash-basis method on impaired loan |  | 100,000 | 142,000 |  |  | $ 181,000
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk |  | $ 1,649,000 | 2,818,000 | $ 2,818,000 | $ 2,818,000 |
Commercial loans |  |  |  |  |  |
Number of business loans with payment deferrals granted | loan |  |  |  | 479 |  |
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 |  |  |  |  |  |
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 |
Payoff of commercial credit |  | $ (500,000) |  |  |  |
Commercial | Small Business Line of Credit |  |  |  |  |  |
Receipt |  | $ (400,000) |  |  |  |
Real estate Commercial |  |  |  |  |  |
Number of loans | contract |  |  |  |  | 3 | 1
Pre-Modification Recorded Investment |  |  | 1,073,000 |  |  | $ 346,000
Post-Modification Recorded Investment |  |  | 1,073,000 |  |  | 346,000
Recorded Investment |  |  | $ 1,046,000 | $ 1,046,000 | $ 1,046,000 | $ 241,000
Consumer |  |  |  |  |  |
Number of business loans with payment deferrals granted | loan | 512 |  |  |  |  |

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