Premises and Equipment (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Capital lease obligations	$ 1,450	$ 1,550
Operating leases, rent expense	25,400	22,000	$ 21,400
Depreciation and amortization expense	42,600	42,200	$ 37,100
Premises and equipment transferred to/(from) other assets, net	$ 911	$ 3,300