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INCOME TAXES (Effective Income Tax Rate Reconciliation) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Provision for (benefit from) income taxes computed at federal statutory rate $ 14,034 $ 1,910 $ (15,359)
Increase (decrease) in taxes due to:      
Tax-exempt interest (1,710) (1,616) (1,471)
Investment in life insurance (894) (663) (683)
State income taxes (benefit), net of federal tax offset 539 (2,260) (495)
Tax credits (788) (840) (816)
Valuation allowance (36,385) 3,322 36,171
Other 419 147 666
Provision for (benefit from) income taxes $ (24,785) $ 0 $ 18,013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Federal income tax statutory rate 35.00% 35.00% 35.00%
Increase (decrease) in tax rate due to:      
Tax-exempt interest (4.30%) (29.60%) 3.40%
Investment in life insurance (2.20%) (12.10%) 1.60%
State income taxes (benefit), net of federal tax offset 1.30% (41.50%) 1.10%
Tax credits (2.00%) (15.40%) 1.90%
Valuation allowance (90.70%) 60.90% (82.40%)
Other 1.10% 2.70% (1.60%)
Effective income tax rate (61.80%) 0.00% (41.00%)