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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 |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Total | $ 885 | $ 1,242 |
Interest Income Recognized, Total | 0 | 14 |
Impaired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 451 |  | $ 1,319
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 451 |  | 1,319
Unpaid Principal Balance, With no related allowance recorded | 702 |  | 1,747
Unpaid Principal Balance, With an allowance recorded | 702 |  | 1,747
Associated Allowance | 0 |  | 0
Residential Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Total | 0 | 23 |
Interest Income Recognized, Total | 0 | 0 |
Commercial Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Total | 885 | 1,219 |
Interest Income Recognized, Total | 0 | $ 14 |
Commercial Real Estate Loans [Member] | Impaired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 451 |  | 1,319
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 451 |  | 1,319
Unpaid Principal Balance, With no related allowance recorded | 702 |  | 1,747
Unpaid Principal Balance, With an allowance recorded | 702 |  | 1,747
Associated Allowance | $ 0 |  | $ 0

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