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Fair Value - Valuation Methodology and Unobservable Inputs (Details) - Non-Recurring Basis - Significant Unobservable Inputs (Level 3) - Third Party Appraisals | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Impaired loans carried at fair value of collateral | Minimum |  |
Fair value quantitative information |  |
Adjustment for differences between the comparable sales (as a percent) | (16.00%) | (2.00%)
Impaired loans carried at fair value of collateral | Maximum |  |
Fair value quantitative information |  |
Adjustment for differences between the comparable sales (as a percent) | 7.00% | 0.00%
Impaired loans carried at fair value of collateral | Weighted Average |  |
Fair value quantitative information |  |
Adjustment for differences between the comparable sales (as a percent) | (4.00%) | (1.00%)
Real estate owned |  |
Fair value quantitative information |  |
Adjustment for differences between the comparable sales (as a percent) | (6.00%) |
Real estate owned | Weighted Average |  |
Fair value quantitative information |  |
Adjustment for differences between the comparable sales (as a percent) | (6.00%) |

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- Definition Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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