Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Right-of-use assets	$ 31,329
Premises and equipment, gross	129,501	$ 130,618
Less accumulated depreciation and amortization	(91,227)	(97,201)
Premises and equipment, net	38,274	33,417
Computer Software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	24,377	46,029
Computer Hardware
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	32,747	34,240
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	22,019	27,798
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	8,550	9,689
Office Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	6,929	7,370
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	3,506	4,674
Other
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 44	$ 818