Other Operating Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Professional services	$ 16,685	$ 19,500	$ 14,630
Postage	5,785	4,686	4,599
Telephone	5,947	4,262	4,294
Credit card expense	14,338	12,188	11,328
Marketing	8,410	11,141	6,929
Operating supplies	2,346	1,980	1,824
Amortization of intangibles	11,009	7,668	5,945
Branch right sizing expense	1,341	434	3,600
Other expense	45,714	27,020	20,364
Total other operating expenses	$ 111,575	$ 88,879	$ 73,513