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Fair Value Measurement (Fair Value Inputs, Assets, Quantitative Information) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Impaired Loan [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Measurements, Valuation Techniques | Appraisal of collateral | Appraisal of collateral
Fair Value Disclosure, Unobservable Input Range | Appraisal adjustments | Appraisal adjustments
Impaired Loan [Member] | Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 4,995 | $ 6,090
Impaired Loan [Member] | Nonrecurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 4,995 | $ 6,090
Foreclosed Assets Held for Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Measurements, Valuation Techniques | Appraisal of collateral | Appraisal of collateral
Fair Value Disclosure, Unobservable Input Range | Appraisal adjustments | Appraisal adjustments
Foreclosed Assets Held for Sale [Member] | Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 581 |
Foreclosed Assets Held for Sale [Member] | Nonrecurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 581 |
Mortgage Servicing Rights [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Measurements, Valuation Techniques | Multiple of annual service fee | Multiple of annual service fee
Fair Value Disclosure, Unobservable Input Range | Estimated prepayment speed based on rate and term | Estimated prepayment speed based on rate and term
Mortgage Servicing Rights [Member] | Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 107 | $ 126
Mortgage Servicing Rights [Member] | Nonrecurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 107 | $ 126
Minimum [Member] | Discount Rate [Member] | Appraisal of Collateral [Member] | Impaired Loan [Member] | Unobservable Input - Appraisal Adjustments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 26.00% | 6.00%
Minimum [Member] | Discount Rate [Member] | Appraisal of Collateral [Member] | Foreclosed Assets Held for Sale [Member] | Unobservable Input - Appraisal Adjustments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 17.00% | 0.00%
Minimum [Member] | Prepayment Rate [Member] | Multiple of Annual Service [Member] | Mortgage Servicing Rights [Member] | Unobservable Input Estimated Prepayment Speed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 70.00% | 70.00%
Maximum [Member] | Discount Rate [Member] | Appraisal of Collateral [Member] | Impaired Loan [Member] | Unobservable Input - Appraisal Adjustments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 100.00% | 51.00%
Maximum [Member] | Discount Rate [Member] | Appraisal of Collateral [Member] | Foreclosed Assets Held for Sale [Member] | Unobservable Input - Appraisal Adjustments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 17.00% | 0.00%
Maximum [Member] | Prepayment Rate [Member] | Multiple of Annual Service [Member] | Mortgage Servicing Rights [Member] | Unobservable Input Estimated Prepayment Speed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 100.00% | 100.00%
Weighted Average [Member] | Discount Rate [Member] | Appraisal of Collateral [Member] | Impaired Loan [Member] | Unobservable Input - Appraisal Adjustments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 36.00% | 28.00%
Weighted Average [Member] | Discount Rate [Member] | Appraisal of Collateral [Member] | Foreclosed Assets Held for Sale [Member] | Unobservable Input - Appraisal Adjustments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 17.00% | 0.00%
Weighted Average [Member] | Prepayment Rate [Member] | Multiple of Annual Service [Member] | Mortgage Servicing Rights [Member] | Unobservable Input Estimated Prepayment Speed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 99.00% | 98.00%

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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