PREMISES AND EQUIPMENT, NET (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 183,767		$ 183,767		$ 157,422
Less: accumulated depreciation and amortization	(82,805)		(82,805)		(70,170)
Total	100,962		100,962		87,252
Depreciation and amortization expense, inclusive of capital leases	7,200	4,600	13,375	9,306
Computer hardware and software
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	122,072		122,072		103,400
Office equipment and other
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	31,627		31,627		28,057
Furniture and fixtures
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	9,844		9,844		8,391
Leasehold improvements
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 20,224		$ 20,224		$ 17,574