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Fair Value (Narrative Disclosures) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount1 | $ 0 | $ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount1 | 0 | 0
Fair value, assets, transfers into level 3 | 0 | 0
Fair value, assets, transfers out of level 3 | 0 | 0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount1 | 0 | 0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount1 | 0 | 0
Fair value, liabilities, transfers into level 3 | 0 | 0
Fair value, liabilities, transfers out of level 3 | 0 | 0
Servicing Asset at Fair Value, Amount | 1,839,000 | 1,906,000
Commercial paper | 17,400,000 | 20,300,000
FHLB stock par value equals carrying value | $ 100.00 |
Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Quantification of unobservable inputs for level 3 values for impaired loans | 15.00% |
Maximum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Quantification of unobservable inputs for level 3 values for impaired loans | 21.00% |
Weighted average |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Quantification of unobservable inputs for level 3 values for impaired loans | 18.00% |
Impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets measured on a non-recurring basis, fair value | $ 15,147,000 | 13,365,000
Foreclosed properties |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets measured on a non-recurring basis, fair value | 1,069,000 | 1,472,000
Fair Value Measurements - Level 3 Inputs | Impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets measured on a non-recurring basis, fair value | 5,084,000 | 1,097,000
Fair Value Measurements - Level 3 Inputs | Foreclosed properties |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets measured on a non-recurring basis, fair value | $ 0 | $ 0

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Unsecured short-term debt instrument issued by corporations which are highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3052-108585 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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