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Loans and Allowance for Loan Losses - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) Loan | Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Dental practice loans | $ 584,384,000 | $ 598,615,000 |
Qualifying loans pledged to secure the line of credit from FHLB | 343,600,000 | 309,900,000 |
Allowance for loan losses | $ 8,559,000 | $ 6,361,000 | $ 4,134,000
Number of loans eligible for short term deferrals | Loan | 744 | 744 |
Number of loans returned to normal performing status | Loan | 1 |  |
Short-term deferrals on loans granted | $ 189,600,000 | $ 189,600,000 |
Loan modifications excluded from TDR calssification based amount | 0 |  |
Modified Loan Terms |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Allowance for loan losses | 6,000 | 17,000 |
90 Days or Greater Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Dental practice loans | 4,334,000 | 3,738,000 |
Total Past Due | $ 0 | $ 0 |
Small Business Administration |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Number of paycheck protection program loans | Loan | 1,901 | 1,901 |
Paycheck protection program loans | $ 196,400,000 | $ 196,400,000 |
Dental Practice Loans |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Dental practice loans | $ 179,800,000 | $ 170,800,000 |
Dental practice loans in percentage | 30.60% | 29.20% |

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