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Loans and Allowance for Loan Losses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) Loan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]
Dental practice loans	$ 598,615,000	$ 252,090,000
Qualifying loans pledged to secure the line of credit from FHLB	309,900,000	115,400,000
Allowance for loan losses	$ 6,361,000	4,134,000	$ 4,022,000
Number of loans eligible for short term deferrals | Loan	737
Short-term deferrals on loans granted	$ 186,900,000
Modified Loan Terms
Financing Receivable Recorded Investment Past Due [Line Items]
Allowance for loan losses	17,000	6,000
Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 0	0
Small Business Administration
Financing Receivable Recorded Investment Past Due [Line Items]
Number of paycheck protection program loans | Loan	1,171
Paycheck protection program loans	$ 130,300,000
Dental Practice Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Dental practice loans	$ 170,800,000	$ 0
Dental practice loans in percentage	29.20%

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Amount of financing receivable 90 days or more past due and still accruing.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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