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Loans and Allowance for Loan Losses - Narrative (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
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Financing Receivable, Modifications [Line Items] |  |
Loans on nonaccrual | $ 1,260,000 | $ 1,415,000
Trouble Debt Restructuring [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Loans that met criteria for restructured | 42,000 | 608,000
Loans on nonaccrual | $ 0 | $ 442,000

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