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Loans Receivable and Allowance for Credit Losses - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Oct. 01, 2021
Jan. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans purchased $ 10,623,000 $ 39,022,000        
Loans receivable, gross $ 878,769,000   $ 848,316,000      
Maximum period of credit extension 18 months          
Loans receivable, term to reset to FHLB rate 5 years          
Period for charged off of open-end credits 180 days          
Period for charged off of close-end credits 120 days          
Interest lost on nonaccrual loans $ 63,000 115,000        
Maximum period for charged off of consumer installment loans 180 days          
Number of contract modifications 0          
Discount to appraisal value 5.80%          
Discount of appraisal value, selling costs 8.00%          
Unfunded Loan Commitment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit loss $ 700,000          
SBA Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross 34,000,000   32,500,000      
Percentage of principal balance guaranteed       75.00% 75.00% 90.00%
Transfer of loans held-for-sale to portfolio loans 0          
SBA CARES Act Paycheck Protection Program            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross 158,000   157,000      
Syndicated and Leveraged Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross 5,800,000          
Non-Accrual Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Impaired financing receivable, interest income, cash basis $ 282,000 90,000        
Commercial Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum percentage of credit extension based on market value of collateral 75.00%          
Loans purchased $ 0 20,700,000        
Loans receivable, gross $ 464,410,000   437,443,000      
Multi-family Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum percentage of credit extension based on market value of collateral 80.00%          
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage of maximum loan to value 75.00%          
Loans receivable, gross $ 7,052,000   4,922,000      
Residential Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans purchased 0          
Loans receivable, gross 118,892,000   124,140,000      
Consumer and Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross 132,410,000   141,091,000      
Consumer and Other | Unsecured Consumer Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross 76,200,000   78,900,000      
Consumer and Other | Unsecured Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans purchased 9,300,000 $ 18,400,000        
Consumer and Other | Home equity lines of credit            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans purchased 1,300,000          
Construction to Permanent - CRE            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 2,232,000   $ 1,933,000      
Construction to Permanent - CRE | Minimum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable term 20 years          
Construction to Permanent - CRE | Maximum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable term 25 years