Loans Receivable 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 ($)
Accounts Notes And Loans Receivable [Line Items]
Restructured loans | Loan	0	0
Number of troubled debt restructured loans | Loan	30	32
Troubled debt restructured loans	$ 8,700,000	$ 9,700,000
Troubled debt restructured loan, accrual status	6,200,000	6,600,000
Impairment reserves	$ 243,000	$ 292,000	$ 459,000
Number of loan held for sale | Loan		1
Loans held for sale		$ 1,000,000.0
Mortgage World Bankers Inc
Accounts Notes And Loans Receivable [Line Items]
Number of loan held for sale | Loan	27	70
Loans held for sale	$ 15,500,000	$ 34,400,000
Troubled Debt Restructured Loans
Accounts Notes And Loans Receivable [Line Items]
Impairment reserves	$ 243,000	$ 292,000
Minimum
Accounts Notes And Loans Receivable [Line Items]
Strong Pass Loans to new or existing borrowers collateralized percentage	90.00%