Goodwill and Other Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 35,353	$ 34,248
Accumulated Amortization and Fair Value Adjustments	20,786	17,597
Net Carrying Amount	14,567	16,651
Covenants Not To Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	710	710
Accumulated Amortization and Fair Value Adjustments	495	205
Net Carrying Amount	215	505
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,788	6,788
Accumulated Amortization and Fair Value Adjustments	1,864	1,004
Net Carrying Amount	4,924	5,784
Customer Related Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,381	12,381
Accumulated Amortization and Fair Value Adjustments	9,509	8,504
Net Carrying Amount	2,872	3,877
Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,474	14,369
Accumulated Amortization and Fair Value Adjustments	8,918	7,884
Net Carrying Amount	$ 6,556	$ 6,485