Fair Value Measurement Schedule of Significant Observable Inputs Used in Fair Value Measurement of Level 3 Assets (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 19,561	$ 26,956
Other real estate	1,931	2,175
Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	19,561	26,956
Other real estate	$ 1,931	2,175
Impaired Loans Fair Value Disclosure Nonrecurring		26,956
Other Real Estate Fair Value Disclosure Nonrecurring		$ 2,175