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Federal Home Loan Bank Borrowings (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 06, 2018
Jan. 17, 2018
Feb. 28, 2018
Dec. 31, 2018
Dec. 31, 2017
Federal Home Loan Bank, Advances [Line Items]          
FHLB, prepayment borrowings due 2019   $ 15,000,000      
FHLB, prepayment borrowings due 2021 $ 15,000,000 $ 15,000,000      
FHLB, prepayment borrowings due 2022 $ 15,000,000        
FHLB, prepayment fee     $ 0    
Federal home loan bank stock       $ 12,172,000 $ 15,005,000
Loans receivable 1 to 4 family mortgage loans Pledged As Collateral       290,250,000 398,250,000
Loans receivable commercial real estate and multi family mortgage loans pledged as collateral       296,530,000 298,850,000
Loan borrowed against collateral       $ 0 $ 0
Federal Home Loan Bank Borrowings Due year three [Member]          
Federal Home Loan Bank, Advances [Line Items]          
Effective interest rates       3.05%  
Federal Home Loan Bank Borrowings Due year five [Member]          
Federal Home Loan Bank, Advances [Line Items]          
Effective interest rates       2.44%  
Federal Home Loan Bank Advances [Member]          
Federal Home Loan Bank, Advances [Line Items]          
Effective interest rates       3.65%  
Minimum [Member] | Federal Home Loan Bank Borrowings Due year eight [Member] [Domain] [Domain] [Domain]          
Federal Home Loan Bank, Advances [Line Items]          
Effective interest rates       2.54%  
Maximum [Member] | Federal Home Loan Bank Borrowings Due year eight [Member] [Domain] [Domain] [Domain]          
Federal Home Loan Bank, Advances [Line Items]          
Effective interest rates       3.07%