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Commitments - Schedule of Financial Commitments whose Contractual Amount Represents Credit Risk (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Loss Contingencies [Line Items] |  |
Financial commitments, contractual amount | $ 200,497 | $ 170,597
Commitments to Make Loans |  |
Loss Contingencies [Line Items] |  |
Financial commitments, contractual amount | 97,116 | 68,003
Unused Lines of Credit |  |
Loss Contingencies [Line Items] |  |
Financial commitments, contractual amount | 97,662 | 92,378
Commercial and Similar Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Financial commitments, contractual amount | 4,144 | 8,966
Standby Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Financial commitments, contractual amount | $ 1,575 | $ 1,250

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