Premises and Equipment (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Capital lease obligations	$ 1,600	$ 1,700
Operating leases, rent expense	21,400	23,100	$ 22,800
Depreciation and amortization expense	37,100	35,300	33,900
Premises and equipment transferred to other properties held for sale	25,231	$ 2,340	$ 16,613
Disposed assets from furniture and equipment	$ 68,400