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Loans - Additional Information (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan amount $ 522,601,000 $ 554,985,000  
SBA fee earned 26,560,000 24,784,000  
Loans pledged as collateral $ 35,510,000 $ 65,587,000  
Defaults on TDRs that were modified as TDRs | loan 0 0  
Amount of loans under modified terms   $ 38,000,000.0  
Provision for (recovery of) loan losses $ (500,000) 950,000  
Loans and leases receivable, allowance 3,423,000 3,970,000 $ 3,186,000
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 1,364,000 1,507,000  
Financing Receivable, Allowance for Credit Losses 0 0  
Impaired Financing Receivable, Interest Income, Cash Basis Method $ 88,000 84,000  
Guaranteed student loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage Of Recovery Loss On Portfolio From Historical Experience 98.00%    
Unallocated Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases receivable, allowance $ 422,000 154,000  
PPP Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan amount $ 32,601,000 $ 136,647,000