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Summary of Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Aug. 20, 2018
Dec. 31, 2018
USD ($)
store
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Significant Accounting Policies [Line Items]        
Number of full-service banking offices | store   5    
Stock split description   the Company effected a 1-for-5.5 reverse stock split, whereby each 5.5 shares of the Company's common stock were reclassified into one share of common stock.    
Reverse stock split ratio 5.5      
Cash exceeded federally insured limits   $ 59,200    
Cash held, not federally insured   56,800    
Interest-bearing deposits in other financial institutions   100 $ 100  
Minimum balance of loans individually evaluated for impairment   250    
Balance outstanding in joint ventures   595 325  
Income recognized on joint ventures   $ 69 20  
Tax benefit greater than being realized on examination   50.00%    
FRB regulatory reserve requirement   $ 3,502 $ 718  
Subsequent Event [Member] | ASU 2016-02 [Member]        
Significant Accounting Policies [Line Items]        
Operating lease, right-of-use asset       $ 2,400
Operating lease, liabilities       $ 2,400
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%    
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] | Maximum [Member]        
Significant Accounting Policies [Line Items]        
Lending amount up to the percentage of collateral   80.00%    
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    
Real Estate Commercial [Member] | Minimum [Member]        
Significant Accounting Policies [Line Items]        
Fixed rates loans limit, period   3 years    
Real Estate Commercial [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 [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