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Loans and Allowance for Credit Losses - Loan Portfolio by Impairment Methodology (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | $ 899,320 | $ 755,361
Ending balance: individually evaluated for impairment | 6,366 | 5,269
Ending balance: collectively evaluated for impairment | 892,954 | 750,092
Commercial |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 115,812 | 114,161
Ending balance: individually evaluated for impairment | 377 | 487
Ending balance: collectively evaluated for impairment | 115,435 | 113,674
Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 677,467 | 550,796
Ending balance: individually evaluated for impairment | 4,846 | 4,238
Ending balance: collectively evaluated for impairment | 672,621 | 546,558
Consumer |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 106,041 | 90,404
Ending balance: individually evaluated for impairment | 1,143 | 544
Ending balance: collectively evaluated for impairment | $ 104,898 | $ 89,860

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