Contingent Liabilities and Commitments with Off-Balance Sheet Risk - Summary of Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commitments to extend credit	$ 532,082	$ 343,245
Unfunded limited partner equity commitment	10,148	2,911
Secured
Standby letters of credit and financial guarantees written	10,776	9,593
Unsecured
Standby letters of credit and financial guarantees written	$ 554	$ 93