FAIR VALUE ACCOUNTING AND MEASUREMENT (Asset Inputs) (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Securities—trading, Fair Value	$ 32,404,000		$ 40,258,000	$ 32,404,000
Securities—trading, Amortized Cost	37,055,000		47,480,000	37,055,000
Available-for-sale Debt Securities, Amortized Cost Basis	387,521,000		411,424,000	387,521,000
TRUP CDO Securities [Member] | Income approach, using discounted cash-flow model [Member] | Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Securities—trading, Fair Value	0		$ 10,000,000	0
TPS Securities [Member] | Income approach, using discounted cash-flow model [Member] | Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset gains (losses)	(41,000)			(84,000)
Securities—trading, Amortized Cost	$ 19,000,000			$ 19,000,000
Discount Rate, Description of Variable Rate Basis
Discount Rate, Basis Spread on Variable Rate Basis	5.00%		5.25%	5.00%
Carrying Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Securities—trading, Fair Value	$ 32,404,000		$ 40,258,000	$ 32,404,000
TRUP CDO Security One [Member] | TRUP CDO Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Proceeds from Sale of Available-for-sale Securities, Debt				2,300,000
Available-for-sale Debt Securities, Amortized Cost Basis	2,900,000			2,900,000
Gain (Loss) on Sale of Debt Investments				555,000
Valuation Allowances and Reserves, Period Increase (Decrease)				1,200,000
TRUP CDO Security One [Member] | Carrying Value | TRUP CDO Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale Securities, Debt Securities	1,700,000			1,700,000
Gain (Loss) on Sale of Debt Investments				(642,000)
TRUP CDO Security Two [Member] | TRUP CDO Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Proceeds from Sale of Available-for-sale Securities, Debt				109,000
Available-for-sale Debt Securities, Amortized Cost Basis	0			0
Valuation Allowances and Reserves, Period Increase (Decrease)				$ 109,000
TRUP CDO Security Other Remaining [Member] | Carrying Value | TRUP CDO Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Gain (Loss) on Sale of Debt Investments	$ 1,300,000	$ 665,000