Other Operating Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Professional services	$ 4,443	$ 3,962	$ 8,683	$ 9,131
Postage	1,441	1,204	2,925	2,335
Telephone	2,064	982	2,969	2,060
Credit card expense	3,188	3,107	6,416	5,944
Marketing	1,765	1,687	3,407	3,033
Operating supplies	583	459	1,332	814
Amortization of intangibles	2,785	1,554	5,623	3,104
Branch right sizing expense	21	99	85	217
Other expense	9,895	6,831	20,239	13,134
Total other operating expenses	$ 26,185	$ 19,885	$ 51,679	$ 39,772