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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, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 1,238 |  | $ 1,247
Impaired Financing Receivable, Recorded Investment | 1,238 |  | 1,247
Unpaid Principal Balance, With no related allowance recorded | 1,515 |  | 1,524
Unpaid Principal Balance, Total | 1,515 |  | 1,524
Associated Allowance | 0 |  | 0
Average Recorded Investment, Total | 1,242 | $ 2,642 |
Interest Income Recognized, Total | 14 | 22 |
Residential Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 23 |  | 23
Impaired Financing Receivable, Recorded Investment | 23 |  | 23
Unpaid Principal Balance, With no related allowance recorded | 28 |  | 28
Unpaid Principal Balance, Total | 28 |  | 28
Associated Allowance | 0 |  | 0
Average Recorded Investment, Total | 23 | 83 |
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 | 1,215 |  | 1,224
Impaired Financing Receivable, Recorded Investment | 1,215 |  | 1,224
Unpaid Principal Balance, With no related allowance recorded | 1,487 |  | 1,496
Unpaid Principal Balance, Total | 1,487 |  | 1,496
Associated Allowance | 0 |  | $ 0
Average Recorded Investment, Total | 1,219 | 2,559 |
Interest Income Recognized, Total | $ 14 | $ 22 |

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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