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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Average Recorded Investment, Total $ 601 $ 1,225 $ 840 $ 1,217  
Interest Income Recognized, Total 24 16 24 30  
Impaired Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 752   752   $ 1,319
Impaired Financing Receivable, with Related Allowance, Recorded Investment 752   752   1,319
Unpaid Principal Balance, With no related allowance recorded 1,338   1,338   1,747
Unpaid Principal Balance, With an allowance recorded 1,338   1,338   1,747
Associated Allowance 0   0   0
Residential Real Estate Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Average Recorded Investment, Total 0 23 0 23  
Interest Income Recognized, Total 0 0 0 0  
Commercial Real Estate Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Average Recorded Investment, Total 601 1,202 840 1,194  
Interest Income Recognized, Total 24 $ 16 24 $ 30  
Commercial Real Estate Loans [Member] | Impaired Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 752   752   1,319
Impaired Financing Receivable, with Related Allowance, Recorded Investment 752   752   1,319
Unpaid Principal Balance, With no related allowance recorded 1,338   1,338   1,747
Unpaid Principal Balance, With an allowance recorded 1,338   1,338   1,747
Associated Allowance $ 0   $ 0   $ 0