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Loans Receivable and Allowance for Credit Losses - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
Oct. 01, 2021
Jan. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans purchased     $ 19,751,000 $ 125,765,000        
Loans receivable, gross $ 889,892,000   $ 889,892,000   $ 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     90 days          
Interest lost on nonaccrual loans, impaired loans 328,000 $ 159,000 $ 605,000 262,000        
Interest lost on nonaccrual loans $ 152,000 $ 33,000 $ 396,000 237,000        
Maximum period for charged off of consumer installment loans     180 days          
Number of contract modifications 0 0            
Discount to appraisal value 5.80%   5.80%          
Discount of appraisal value, selling costs 8.00%   8.00%          
Unfunded Loan Commitment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for credit loss $ 1,400,000   $ 1,400,000          
SBA Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable, gross 32,300,000   32,300,000   32,500,000      
Percentage of principal balance guaranteed           75.00% 75.00% 90.00%
Transfer of loans held-for-sale to portfolio loans 0 $ 0 0 0        
SBA CARES Act Paycheck Protection Program                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable, gross 134,000   134,000   157,000      
Syndicated and Leveraged Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable, gross 5,800,000   $ 5,800,000   5,800,000      
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 0 $ 0 20,700,000        
Loans receivable, gross 499,132,000   $ 499,132,000   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 3,790,000   $ 3,790,000   4,922,000      
Residential Real Estate                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans purchased 0 0 0 0        
Loans receivable, gross 112,600,000   112,600,000   124,140,000      
Consumer and Other                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable, gross 111,411,000   $ 111,411,000   141,091,000      
Consumer and Other | Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable term     2 years          
Consumer and Other | Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable term     5 years          
Consumer and Other | Unsecured Consumer Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable, gross 58,600,000   $ 58,600,000   78,900,000      
Consumer and Other | Unsecured Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans purchased 1,800,000 25,500,000 15,400,000 75,800,000        
Consumer and Other | Home equity lines of credit                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans purchased 1,500,000 $ 1,600,000 1,500,000 $ 29,300,000        
Construction to Permanent - CRE                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable, gross $ 2,463,000   $ 2,463,000   $ 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