PREMISES AND EQUIPMENT, NET (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 170,759		$ 157,422
Less: accumulated depreciation and amortization	(76,220)		(70,170)
Total	94,539		87,252
Depreciation and amortization expense, inclusive of capital leases	6,246	4,724
Computer hardware and software
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	111,564		103,400
Office equipment and other
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	30,632		28,057
Furniture and fixtures
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	9,978		8,391
Leasehold improvements
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 18,585		$ 17,574