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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

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