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SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands	Feb. 07, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Derivative, notional amount		$ 2,199,862				$ 1,366,667				$ 2,199,862	$ 1,366,667
Interest expense		13,276	$ 12,540	$ 11,577	$ 10,779	$ 9,676	$ 8,481	$ 7,766	$ 7,258	48,172	33,181	$ 28,351
FHLBB borrowings \| Interest Rate Swap \| Cash Flow Hedging
Subsequent Event [Line Items]
Derivative, notional amount		$ 300,000								300,000
Interest expense										$ 3,981	$ 0
Subsequent Event \| Accumulated Net Gain (Loss) from Cash Flow Hedges \| Reclassification out of Accumulated Other Comprehensive Income
Subsequent Event [Line Items]
Interest expense	$ 6,600