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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