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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 |

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