UNSECURED BORROWINGS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 15, 2016
Debt Instrument [Line Items]
Junior subordinated notes maturity term		30 years
Face amount of junior subordinated notes		$ 100,000
Interest paid on outstanding borrowings		79,100	$ 59,700	$ 71,100
Borrowings Outstanding		$ 97,986	$ 97,882
Effective interest rate	[1]	8.08%	8.68%
October 2035 [Member]
Debt Instrument [Line Items]
Face amount of junior subordinated notes		$ 35,000
Junior subordinated notes, maturity period		Oct. 31, 2035
Borrowings Outstanding		$ 34,234	$ 34,196
Effective interest rate	[1]	7.91%	8.51%
December 2035 [Member]
Debt Instrument [Line Items]
Face amount of junior subordinated notes		$ 40,000
Junior subordinated notes, maturity period		Dec. 31, 2035
Borrowings Outstanding		$ 39,244	$ 39,202
Effective interest rate	[1]	7.68%	8.64%
September 2036 [Member]
Debt Instrument [Line Items]
Face amount of junior subordinated notes		$ 25,000
Junior subordinated notes, maturity period		Sep. 30, 2036
Borrowings Outstanding		$ 24,508	$ 24,484
Effective interest rate	[1]	8.96%	8.97%
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Interest paid on outstanding borrowings		$ 8,400	$ 8,400	$ 8,600
20 Year Floating Rate [Member]
Debt Instrument [Line Items]
Junior subordinated notes, earliest redemption option exercise date		Sep. 15, 2016
Effective interest rate					7.77%

[1] The average borrowing rate for total unsecured borrowings, adjusted for the effects of related Derivatives held for hedging purposes, will decline to 7.77% effective September 15, 2016, coinciding with the 20-year floating rate period of the September 2036 notes.