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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
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 1,221   $ 1,221   $ 1,247
Impaired Financing Receivable, Recorded Investment 1,221   1,221   1,247
Unpaid Principal Balance, With no related allowance recorded 1,562   1,562   1,524
Unpaid Principal Balance, Total 1,562   1,562   1,524
Associated Allowance 0   0   0
Average Recorded Investment, Total 1,240 $ 1,446 1,218 $ 1,488  
Interest Income Recognized, Total 15 12 45 41  
Residential Real Estate Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 23   23   23
Impaired Financing Receivable, Recorded Investment 23   23   23
Unpaid Principal Balance, With no related allowance recorded 28   28   28
Unpaid Principal Balance, Total 28   28   28
Associated Allowance 0   0   0
Average Recorded Investment, Total 23 23 23 23  
Interest Income Recognized, Total 0 0      
Commercial Real Estate Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,198   1,198   1,224
Impaired Financing Receivable, Recorded Investment 1,198   1,198   1,224
Unpaid Principal Balance, With no related allowance recorded 1,534   1,534   1,496
Unpaid Principal Balance, Total 1,534   1,534   1,496
Associated Allowance 0   0   $ 0
Average Recorded Investment, Total 1,217 1,423 1,195 1,465  
Interest Income Recognized, Total $ 15 $ 12 $ 45 $ 41