FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012
Unobservable Input
Fixed maturities, held-to-maturity	300,000,000
Level 3
Unobservable Input
Financial instruments with book value approximating to fair value	69,800,000
Fixed maturities, held-to-maturity	4,300,000
Level 3 | Equity securities
Unobservable Input
FHLB stock	65,500,000
Level 3 | Embedded derivatives - GMWB
Valuation of Level 3 Financial Instruments
Fair Value of Assets	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 Assets	129,468,000
Level 3 | Annuity account balances | Actuarial cash flow model | Low end of range
Unobservable Input
Lapse (as a percent)	2.20%
Nonperformance risk (as a percent)	0.09%
Expenses per policy	88,000
Return on assets (as a percent)	1.50%
Level 3 | Annuity account balances | Actuarial cash flow model | High end of range
Unobservable Input
Lapse (as a percent)	45.00%
Nonperformance risk (as a percent)	1.34%
Expenses per policy	108,000
Return on assets (as a percent)	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)	5.81%
Withdrawal rate (as a percent)	2.20%
Level 3 | Other asset-backed securities
Valuation of Level 3 Financial Instruments
Fair Value of Assets	596,143,000
Unobservable Input
Financial instruments that are valued using broker quotes	70,500,000
Level 3 | Other asset-backed securities | Discounted cash flow | Low end of range
Unobservable Input
Liquidity premium (as a percent)	0.72%
Paydown rate (as a percent)	8.51%
Level 3 | Other asset-backed securities | Discounted cash flow | High end of range
Unobservable Input
Liquidity premium (as a percent)	1.68%
Paydown rate (as a percent)	18.10%
Level 3 | Other asset-backed securities | Discounted cash flow | Weighted Average
Unobservable Input
Liquidity premium (as a percent)	1.29%
Paydown rate (as a percent)	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	168,007,000
Level 3 | Corporate bonds | Discounted cash flow | Low end of range
Unobservable Input
Spread over treasury (as a percent)	0.92%
Level 3 | Corporate bonds | Discounted cash flow | High end of range
Unobservable Input
Spread over treasury (as a percent)	7.75%
Level 3 | Corporate bonds | Discounted cash flow | Weighted Average
Unobservable Input
Spread over treasury (as a percent)	3.34%