PREMISES AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 248,676	$ 223,131
Less: accumulated depreciation and amortization	(129,555)	(95,372)
Total	119,121	127,759
Depreciation and amortization expense, inclusive of capital leases	36,470	29,046	$ 19,056
Impairment of Long-Lived Assets Held-for-use	4,100	0	$ 0
Computer hardware and software
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	177,010	140,799
Office equipment and other
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	21,720	36,032
Furniture and fixtures
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	14,443	12,231
Leasehold improvements
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 35,503	$ 34,069