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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

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