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Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross   $ 122,306 $ 115,133
Less accumulated depreciation and amortization   (78,996) (61,347)
Premises and equipment, net $ 44,885 43,310 53,786
Computer Hardware and Software [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross   55,132 51,060
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross   28,549 25,467
Office Equipment and Other [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross   13,268 12,506
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross   13,049 12,926
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross   $ 12,308 $ 13,174