PREMISES AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 245,080		$ 245,080		$ 223,131
Less: accumulated depreciation and amortization	(122,664)		(122,664)		(95,372)
Total	122,416		122,416		127,759
Depreciation and amortization expense, inclusive of capital leases	9,205	$ 7,711	27,637	$ 21,086
Computer hardware and software
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	175,144		175,144		140,799
Office equipment and other
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	20,037		20,037		36,032
Furniture and fixtures
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	13,921		13,921		12,231
Leasehold improvements
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 35,978		$ 35,978		$ 34,069