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Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 148,117 $ 118,843
Less accumulated depreciation and amortization (85,373) (61,217)
Premises and equipment, net 62,744 57,626
Computer Software [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 58,322 45,411
Computer Hardware [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 35,192 22,817
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 25,975 23,326
Office Equipment and Other [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 12,114 11,761
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 9,689 9,689
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 6,825 $ 5,839