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Loans Receivable: Narratives (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable    
Loans Receivable, Percentage of Loan Portfolio 8.00%  
Loans and Leases Receivable, Net Amount $ 1,167,083,000 $ 1,103,461,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 0 0
Troubled debt restructuring, charge to Allowance for Loan and Lease Losses 0 0
Troubled Debt Restructuring Commitment To Extend Additional Credit 0 0
Loans and Leases Receivable, Related Parties 0 0
Financing receivable, after allowance $ 1,182,159,000 $ 1,119,536,000
Financing Receivable, Percent Past Due 0.02% 0.02%
Nonperforming Financing Receivable    
Accounts, Notes, Loans and Financing Receivable    
Financing receivable, after allowance $ 193,000 $ 0
Five Largest Borrowing Relationships | Loans receivable | Customer Concentration Risk    
Accounts, Notes, Loans and Financing Receivable    
Loans and Leases Receivable, Net Amount $ 109,600,000  
Concentration risk, percentage 9.30%  
PPP Loan    
Accounts, Notes, Loans and Financing Receivable    
Long-term Debt, Gross $ 785,000 10,800,000
One-to-four family residential    
Accounts, Notes, Loans and Financing Receivable    
Loans Receivable, Percentage of Loan Portfolio 40.30%  
Multifamily    
Accounts, Notes, Loans and Financing Receivable    
Loans Receivable, Percentage of Loan Portfolio 10.70%  
Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable    
Loans Receivable, Percentage of Loan Portfolio 34.40%  
Construction Land Development    
Accounts, Notes, Loans and Financing Receivable    
Loans Receivable, Percentage of Loan Portfolio 6.60%  
CARES Act Modification Loans    
Accounts, Notes, Loans and Financing Receivable    
Loans and Leases Receivable, Net Amount $ 0  
One-to-four family residential    
Accounts, Notes, Loans and Financing Receivable    
Financing receivable, after allowance 475,836,000 385,116,000
One-to-four family residential | Nonperforming Financing Receivable    
Accounts, Notes, Loans and Financing Receivable    
Financing receivable, after allowance 0 0
Multifamily Construction    
Accounts, Notes, Loans and Financing Receivable    
Loans excluded from category 15,500,000 37,200,000
Construction Land Development Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans excluded from category 9,800,000 12,900,000
Commercial Real Estate Construction    
Accounts, Notes, Loans and Financing Receivable    
Loans excluded from category   $ 6,200,000
Commercial Real Estate Permanent | PPP Loan    
Accounts, Notes, Loans and Financing Receivable    
Long-term Debt, Gross $ 785,000