PREMISES AND EQUIPMENT, NET (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 207,532		$ 207,532		$ 157,422
Less: accumulated depreciation and amortization	(91,759)		(91,759)		(70,170)
Total	115,773		115,773		87,252
Depreciation and amortization expense, inclusive of capital leases	7,700	4,500	21,086	13,791
Computer hardware and software
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	136,456		136,456		103,400
Office equipment and other
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	34,699		34,699		28,057
Furniture and fixtures
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	10,162		10,162		8,391
Leasehold improvements
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 26,215		$ 26,215		$ 17,574