PREMISES AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 232,728		$ 232,728		$ 232,870
Less: accumulated depreciation and amortization	(145,668)		(145,668)		(129,397)
Total	87,060		87,060		103,473
Depreciation and amortization	8,900	$ 9,100	18,895	$ 18,346
Computer hardware and software
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	172,535		172,535		164,877
Office equipment and other
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	13,279		13,279		20,188
Furniture and fixtures
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	13,895		13,895		13,997
Leasehold improvements
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 33,019		$ 33,019		$ 33,808