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Loans and Allowance for Credit Losses - Loan Portfolio by Impairment Methodology (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | $ 910,435 | $ 899,320
Ending balance: individually evaluated for impairment | 7,473 | 6,366
Ending balance: collectively evaluated for impairment | 902,962 | 892,954
Commercial |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 112,868 | 115,812
Ending balance: individually evaluated for impairment | 342 | 377
Ending balance: collectively evaluated for impairment | 112,526 | 115,435
Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 693,537 | 677,467
Ending balance: individually evaluated for impairment | 5,768 | 4,846
Ending balance: collectively evaluated for impairment | 687,769 | 672,621
Consumer |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 104,030 | 106,041
Ending balance: individually evaluated for impairment | 1,363 | 1,143
Ending balance: collectively evaluated for impairment | $ 102,667 | $ 104,898

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