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Fair Value Disclosures (Narrative Disclosures) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |
Fair value, assets, level 1 to level 2 transfers | $ 0 | $ 0
Fair value, assets, level 2 to Level 1 transfers | 0 | 0
Fair value, assets, transfers into level 3 | 0 | 0
Fair value, assets, transfers out of level 3 | 0 | 0
Fair value, liabilities, transfers out of level 3 | 0 | 0
Fair value, liabilities, level 1 to level 2 transfers | 0 | 0
Fair value, liabilities, level 2 to level 1 transfers | 0 | 0
Fair value, liabilities, transfers into level 3 | $ 0 | 0
Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Quantification of unobservable inputs for level 3 values for impaired loans | 10.00% |
Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Quantification of unobservable inputs for level 3 values for impaired loans | 50.00% |
Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Quantification of unobservable inputs for level 3 values for impaired loans | 23.00% |
Fair value on a non-recurring basis | Impaired loans |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | $ 17,696,000 | 15,706,000
Fair value on a non-recurring basis | Foreclosed properties |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 2,547,000 | 2,547,000
Fair value on a non-recurring basis | Fair Value Measurements - Level 3 Inputs | Impaired loans |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 17,696,000 | 15,706,000
Fair value on a non-recurring basis | Fair Value Measurements - Level 3 Inputs | Foreclosed properties |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | $ 2,547,000 | $ 2,547,000

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