PRESENTATION OF DEBT ISSUANCE COSTS (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Other assets	$ 35,358	$ 19,244
Total Assets	3,507,313	2,288,524
Junior Subordinated Debentures	15,876	15,873
Total Liabilities	$ 3,166,871	2,113,406
Accounting Standards Update 2015-03 | As previously reported
Debt Instrument [Line Items]
Other assets		19,373
Total Assets		2,288,653
Junior Subordinated Debentures		16,002
Total Liabilities		2,113,535
Accounting Standards Update 2015-03 | As reported under the new guidance
Debt Instrument [Line Items]
Other assets		19,244
Total Assets		2,288,524
Junior Subordinated Debentures		15,873
Total Liabilities		$ 2,113,406