Goodwill and Other Intangible Assets - Changes in Servicing Rights (Details) - Servicing Rights [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning of period	$ 6,548	$ 5,896	$ 6,485	$ 5,877
Servicing rights capitalized	376	652	1,106	1,429
Acquired servicing rights	0	87	0	87
Amortization of servicing rights	(368)	(468)	(1,035)	(1,226)
Changes in valuation allowance	0	0	0	0
End of period	6,556	6,167	6,556	6,167
Residential mortgage and SBA loans serviced for others	$ 997,169	$ 933,470	$ 997,169	$ 933,470