Fair Value - Summary of Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - Commercial and industrial - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Impaired loans	$ 1,432	$ 1,809
Significant Unobservable Inputs (Level 3)
Assets:
Impaired loans	$ 1,432	$ 1,809