FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Unobservable Input
Fixed maturities, held-to-maturity	$ 350,000,000	$ 300,000,000
Level 3
Unobservable Input
Financial instruments with book value approximating to fair value	69,800,000	69,800,000
Level 3 | Equity securities
Unobservable Input
FHLB stock	65,500,000	65,500,000
Level 3 | Other fixed maturity securities
Unobservable Input
Fixed maturities, held-to-maturity	4,300,000	4,300,000
Level 3 | Embedded derivatives - GMWB
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities		169,041,000
Level 3 | Embedded derivatives - GMWB | Actuarial cash flow model | Low end of range
Unobservable Input
Lapse (as a percent)		0.00%
Utilization (as a percent)		93.00%
Nonperformance risk (as a percent)		0.09%
Level 3 | Embedded derivatives - GMWB | Actuarial cash flow model | High end of range
Unobservable Input
Lapse (as a percent)		24.00%
Utilization (as a percent)		100.00%
Nonperformance risk (as a percent)		1.34%
Level 3 | Embedded derivatives - GMWB | Actuarial cash flow model | Weighted Average
Unobservable Input
Mortality (as a percent)		57.00%
Level 3 | Annuity account balances
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	110,590,000	129,468,000
Level 3 | Annuity account balances | Actuarial cash flow model | Low end of range
Unobservable Input
Mortality (as a percent)	49.00%
Lapse (as a percent)	2.20%	2.20%
Nonperformance risk (as a percent)	0.19%	0.09%
Expenses per policy	88,000	88,000
Return on assets (as a percent)	1.50%	1.50%
Level 3 | Annuity account balances | Actuarial cash flow model | High end of range
Unobservable Input
Mortality (as a percent)	80.00%
Lapse (as a percent)	33.00%	45.00%
Nonperformance risk (as a percent)	1.31%	1.34%
Expenses per policy	102,000	108,000
Return on assets (as a percent)	1.85%	1.85%
Level 3 | Annuity account balances | Actuarial cash flow model | Weighted Average
Unobservable Input
Mortality (as a percent)		57.00%
Asset earned rate (as a percent)	5.37%	5.81%
Withdrawal rate (as a percent)	2.20%	2.20%
Level 3 | Embedded derivative - FIA
Valuation of Level 3 Financial Instruments
Fair Value of Liabilities	9,199,000
Level 3 | Embedded derivative - FIA | Actuarial cash flow model | Low end of range
Unobservable Input
Mortality (as a percent)	49.00%
Lapse (as a percent)	2.50%
Nonperformance risk (as a percent)	0.19%
Expenses per policy	83,000
Withdrawal rate (as a percent)	1.10%
Level 3 | Embedded derivative - FIA | Actuarial cash flow model | High end of range
Unobservable Input
Mortality (as a percent)	80.00%
Lapse (as a percent)	40.00%
Nonperformance risk (as a percent)	1.31%
Expenses per policy	97,000
Withdrawal rate (as a percent)	4.50%
Level 3 | Other asset-backed securities
Valuation of Level 3 Financial Instruments
Fair Value of Assets	548,771,000	596,143,000
Unobservable Input
Financial instruments that are valued using broker quotes	171,000,000	70,500,000
Level 3 | Other asset-backed securities | Discounted cash flow | Low end of range
Unobservable Input
Liquidity premium (as a percent)	0.69%	0.72%
Paydown rate (as a percent)	8.37%	8.51%
Level 3 | Other asset-backed securities | Discounted cash flow | High end of range
Unobservable Input
Liquidity premium (as a percent)	1.32%	1.68%
Paydown rate (as a percent)	17.50%	18.10%
Level 3 | Other asset-backed securities | Discounted cash flow | Weighted Average
Unobservable Input
Liquidity premium (as a percent)	0.80%	1.29%
Paydown rate (as a percent)	12.45%	11.40%
Level 3 | Other government-related securities
Valuation of Level 3 Financial Instruments
Fair Value of Assets		20,011,000
Level 3 | Other government-related securities | Discounted cash flow | Weighted Average
Unobservable Input
Spread over treasury (as a percent)		0.30%
Level 3 | Corporate bonds
Valuation of Level 3 Financial Instruments
Fair Value of Assets	192,580,000	168,007,000
Level 3 | Corporate bonds | Discounted cash flow | Low end of range
Unobservable Input
Spread over treasury (as a percent)	0.32%	0.92%
Level 3 | Corporate bonds | Discounted cash flow | High end of range
Unobservable Input
Spread over treasury (as a percent)	6.75%	7.75%
Level 3 | Corporate bonds | Discounted cash flow | Weighted Average
Unobservable Input
Spread over treasury (as a percent)	2.89%	3.34%
Level 3 | Embedded derivative - GMWB
Valuation of Level 3 Financial Instruments
Fair Value of Assets	$ 77,835,000
Level 3 | Embedded derivative - GMWB | Actuarial cash flow model | Low end of range
Unobservable Input
Mortality (as a percent)	49.00%
Lapse (as a percent)	0.00%
Utilization (as a percent)	97.00%
Nonperformance risk (as a percent)	0.19%
Level 3 | Embedded derivative - GMWB | Actuarial cash flow model | High end of range
Unobservable Input
Mortality (as a percent)	80.00%
Lapse (as a percent)	24.00%
Utilization (as a percent)	103.00%
Nonperformance risk (as a percent)	1.31%