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Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) contract | Mar. 31, 2017 USD ($) contract
Troubled debt restructuring categorized by loan classification [Abstract] |  |
Number of contracts | contract | 0 | 1
Pre Modification Outstanding Recorded Investment | $ 0 | $ 3,457
Post Modification Outstanding Recorded Investment, net of related allowance | $ 0 | $ 3,457
Commercial real estate - mortgage |  |
Troubled debt restructuring categorized by loan classification [Abstract] |  |
Number of contracts | contract | 0 | 0
Pre Modification Outstanding Recorded Investment | $ 0 | $ 0
Post Modification Outstanding Recorded Investment, net of related allowance | $ 0 | $ 0
Consumer real estate - mortgage |  |
Troubled debt restructuring categorized by loan classification [Abstract] |  |
Number of contracts | contract | 0 | 0
Pre Modification Outstanding Recorded Investment | $ 0 | $ 0
Post Modification Outstanding Recorded Investment, net of related allowance | $ 0 | $ 0
Construction and land development |  |
Troubled debt restructuring categorized by loan classification [Abstract] |  |
Number of contracts | contract | 0 | 0
Pre Modification Outstanding Recorded Investment | $ 0 | $ 0
Post Modification Outstanding Recorded Investment, net of related allowance | $ 0 | $ 0
Commercial and industrial |  |
Troubled debt restructuring categorized by loan classification [Abstract] |  |
Number of contracts | contract | 0 | 1
Pre Modification Outstanding Recorded Investment | $ 0 | $ 3,457
Post Modification Outstanding Recorded Investment, net of related allowance | $ 0 | $ 3,457
Consumer and other |  |
Troubled debt restructuring categorized by loan classification [Abstract] |  |
Number of contracts | contract | 0 | 0
Pre Modification Outstanding Recorded Investment | $ 0 | $ 0
Post Modification Outstanding Recorded Investment, net of related allowance | $ 0 | $ 0

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