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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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