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Note 4 FAIR VALUE (Detail) - (Table 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2010
Beginning balance $ 247,478
Purchases, issuances, sales and settlements:  
Sales (146,810)
Settlements (93,483)
(240,293)
Total realized and unrealized gains and (losses) (2):  
Included in Other comprehensive income (loss) (14,435) [1]
(22,536) [1]
Ending balance (15,351)
Derivative Financial Instruments [Member] | Trading Securities [Member]
 
Total realized and unrealized gains and (losses) (2):  
Included in Gain (loss) on earnings    [1]
Derivative Financial Instruments [Member] | Net Income, Other [Member]
 
Total realized and unrealized gains and (losses) (2):  
Included in Gain (loss) on earnings (133) [1]
Derivative Financial Instruments [Member]
 
Beginning balance (45)
Purchases, issuances, sales and settlements:  
Settlements (738)
(738)
Total realized and unrealized gains and (losses) (2):  
Included in Other comprehensive income (loss) (14,435) [1]
(14,568) [1]
Ending balance (15,351)
Trading Securities, Auction Rate [Member] | Trading Securities [Member]
 
Total realized and unrealized gains and (losses) (2):  
Included in Gain (loss) on earnings (7,909) [1]
Trading Securities, Auction Rate [Member] | Net Income, Other [Member]
 
Total realized and unrealized gains and (losses) (2):  
Included in Gain (loss) on earnings    [1]
Trading Securities, Auction Rate [Member]
 
Beginning balance 247,464
Purchases, issuances, sales and settlements:  
Sales (146,810)
Settlements (92,745)
(239,555)
Total realized and unrealized gains and (losses) (2):  
Included in Other comprehensive income (loss)    [1]
(7,909) [1]
Trading Securities, Subordinates and Residuals [Member] | Trading Securities [Member]
 
Total realized and unrealized gains and (losses) (2):  
Included in Gain (loss) on earnings (59) [1]
Trading Securities, Subordinates and Residuals [Member] | Net Income, Other [Member]
 
Total realized and unrealized gains and (losses) (2):  
Included in Gain (loss) on earnings    [1]
Trading Securities, Subordinates and Residuals [Member]
 
Beginning balance 59
Total realized and unrealized gains and (losses) (2):  
Included in Other comprehensive income (loss)    [1]
(59) [1]
Trading Securities [Member]
 
Total realized and unrealized gains and (losses) (2):  
Included in Gain (loss) on earnings (7,968) [1]
Net Income, Other [Member]
 
Total realized and unrealized gains and (losses) (2):  
Included in Gain (loss) on earnings $ (133) [1]
[1] Total losses attributable to derivative financial instruments still held at December 31, 2012 and 2011 were $1,173 and $5,114, respectively.