BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2017
Premises and Equipment, Net
Impairment of premises and equipment	$ 4,100	$ 0	$ 0
Goodwill
Impairment of goodwill	$ 55,700	0	0	$ 55,700
Intangible Assets, Net
Impairment of intangible assets		0	0	11,900
Defined Contribution 401(k) Plan
Expense recorded for discretionary amounts contributed		1,200	1,200	$ 1,000
New Accounting Pronouncements
Cumulative effect of an accounting change					$ 0
Estimated revenue to be deferred over future periods (approximately)		10,000
Accumulated other comprehensive income (loss)		733	(1,745)
Operating lease, right-of-use, estimated asset and liability (approximately)		25,000
Restricted cash		$ 3,837	4,127
Accounting Standards Update 2016-09 | Retained earnings
New Accounting Pronouncements
Cumulative effect of an accounting change					$ (932)
Minimum
Intangible Assets, Net
Estimated useful lives		4 years
Maximum
Intangible Assets, Net
Estimated useful lives		20 years
Furniture and fixtures
Premises and Equipment, Net
Estimated useful lives		5 years
Office equipment
Premises and Equipment, Net
Estimated useful lives		5 years
Computer hardware
Premises and Equipment, Net
Estimated useful lives		5 years
Computer software | Minimum
Premises and Equipment, Net
Estimated useful lives		3 years
Computer software | Maximum
Premises and Equipment, Net
Estimated useful lives		7 years
Leasehold improvements | Maximum
Premises and Equipment, Net
Estimated useful lives		10 years
Lenders One
Principles of Consolidation
Total assets		$ 4,600	3,800
Total liabilities		$ 3,100	$ 1,500