Premises and Equipment, Net - Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	$ 418,563	$ 426,166
Less accumulated depreciation and amortization	239,319	230,510
Premises and equipment, net	179,244	195,656
Assets held for sale	5,743	0
Total premises and equipment, net	184,987	195,656
Land [Member]
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	51,097	57,334
Building and Leasehold Improvements [Member]
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	195,296	200,475
Furniture and Equipment [Member]
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	$ 172,170	$ 168,357