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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
store
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Significant Accounting Policies [Line Items]        
Number of full-service banking offices | store   5    
Cash exceeded federally insured limits   $ 160,300    
Cash held, not federally insured   152,700    
Balance outstanding in joint ventures $ 1,406 2,150 $ 1,406  
Income recognized on joint ventures   $ 224 173 $ 57
Tax benefit greater than being realized on examination   50.00%    
Collateral pledged for advances 110,951 $ 242,335 110,951  
Investment 0 0    
Maximum exposure to loss related to investments   0    
Cash [Member]        
Significant Accounting Policies [Line Items]        
Collateral pledged for advances 3,300 $ 3,300 3,300  
Minimum [Member] | Buildings And Related Components [Member]        
Significant Accounting Policies [Line Items]        
Estimated useful life   3 years    
Minimum [Member] | Furniture, fixtures and equipment [Member]        
Significant Accounting Policies [Line Items]        
Estimated useful life   2 years    
Maximum [Member]        
Significant Accounting Policies [Line Items]        
Home equity lines of credit combined with the balance of the prior mortgage liens   89.90%    
Maturity of cash, deposits with other financial institutions   90 days    
Maximum [Member] | Buildings And Related Components [Member]        
Significant Accounting Policies [Line Items]        
Estimated useful life   40 years    
Maximum [Member] | Furniture, fixtures and equipment [Member]        
Significant Accounting Policies [Line Items]        
Estimated useful life   25 years    
Single-Family Residential [Member]        
Significant Accounting Policies [Line Items]        
Collateral pledged for advances 87,076 $ 203,627 87,076  
Single-Family Residential [Member] | Maximum [Member]        
Significant Accounting Policies [Line Items]        
Lending amount up to the percentage of collateral   80.00%    
Multi-Family Residential [Member]        
Significant Accounting Policies [Line Items]        
Collateral pledged for advances 10,970 $ 21,650 10,970  
Multi-Family Residential [Member] | Minimum [Member]        
Significant Accounting Policies [Line Items]        
Fixed rates loans limit, period   3 years    
Multi-Family Residential [Member] | Maximum [Member]        
Significant Accounting Policies [Line Items]        
Lending amount up to the percentage of collateral   85.00%    
Fixed rates loans limit, period   5 years    
Commercial Real Estate [Member]        
Significant Accounting Policies [Line Items]        
Collateral pledged for advances $ 5,750 $ 9,801 $ 5,750  
Commercial Real Estate [Member] | Minimum [Member]        
Significant Accounting Policies [Line Items]        
Fixed rates loans limit, period   3 years    
Commercial Real Estate [Member] | Maximum [Member]        
Significant Accounting Policies [Line Items]        
Lending amount up to the percentage of collateral   85.00%    
Fixed rates loans limit, period   5 years    
Construction loans [Member] | Maximum [Member]        
Significant Accounting Policies [Line Items]        
Lending amount up to the percentage of collateral   80.00%    
Maturity of construction loans convert to permanent loans   30 years