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Note 3 - Securities (Detail) - Securities Gains (Losses) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Proceeds from sales $ 188,556 $ 390,217 $ 855,405
Gains (losses) on sales of securities:      
Gross realized gains 4,103 18,444 26,735
Gross realized losses (757) (1,311) (9)
Net realized gains on securities sales 3,346 17,133 26,726
Non-cash impairment charges:      
Other-than-temporary securities impairment (1,464) (5,364) (48,928)
Portion of other-than-temporary impairment recognized in other comprehensive income (loss) 528 447 24,312
Net non-cash impairment charges (936) (4,917) (24,616)
Net realized gains 2,410 12,216 2,110
Income tax expense on net realized gains 986 4,764 824
Trading (losses) gains, net (1) (691) [1] 1,530 [1] 2,542 [1]
Collateralized Debt Obligations [Member]
     
Non-cash impairment charges:      
Net non-cash impairment charges 936 4,664 24,509
Collateralized Mortgage Backed Securities [Member]
     
Non-cash impairment charges:      
Net non-cash impairment charges   86  
Equity Securities [Member]
     
Non-cash impairment charges:      
Net non-cash impairment charges   167 107
Total [Member]
     
Non-cash impairment charges:      
Net non-cash impairment charges $ 936 $ 4,917 $ 24,616
[1] All trading (losses) gains relate to trading securities still held as of December 31, 2011.