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Loans Receivable and Allowance for Loan Losses (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 1,319 $ 1,247  
Impaired Financing Receivable, Recorded Investment 1,319 1,247  
Unpaid Principal Balance, With no related allowance recorded 1,747 1,524  
Unpaid Principal Balance, Total 1,747 1,524  
Associated Allowance    
Average Recorded Investment, Total 1,220 1,232 $ 0
Interest Income Recognized, Total 67 56 0
Impaired Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Recorded Investment 1,319 1,247  
Associated Allowance 0    
Residential Real Estate Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment   23  
Impaired Financing Receivable, Recorded Investment   23  
Unpaid Principal Balance, With no related allowance recorded   28  
Unpaid Principal Balance, Total   28  
Associated Allowance    
Average Recorded Investment, Total 23
Interest Income Recognized, Total
Commercial Real Estate Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,319 1,224  
Impaired Financing Receivable, Recorded Investment 1,319 1,224  
Unpaid Principal Balance, With no related allowance recorded 1,747 1,496  
Unpaid Principal Balance, Total 1,747 1,496  
Associated Allowance    
Average Recorded Investment, Total 1,220 1,209 0
Interest Income Recognized, Total $ 67 $ 56 $ 0