Loan Commitments and Other Related Activities - Summary of Financial Instruments With Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Unfunded loan commitments
Other Commitments [Line Items]
Financial commitments, contractual amount	$ 18,567	$ 34,867
Unused lines of credit
Other Commitments [Line Items]
Financial commitments, contractual amount	52,076	34,063
Standby letters of credit
Other Commitments [Line Items]
Financial commitments, contractual amount	$ 68	$ 68