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Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 119,675 $ 148,117
Less accumulated depreciation and amortization (82,669) (85,373)
Premises and equipment, net 37,006 62,744
Computer Software [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 43,137 58,322
Computer Hardware [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 29,848 35,192
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 23,425 25,975
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 9,689 9,689
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 8,071 9,200
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 4,141 6,825
Other [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 1,364 $ 2,914