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Note 3 - Securities (Detail) - Securities Gains (Losses) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Proceeds from sales $ 53,118 $ 66,618 $ 97,330 $ 147,601
Gains (losses) on sales of securities:        
Gross realized gains 1,974 2,367 2,782 8,187
Gross realized losses (443) (112) (711) (112)
Net realized gains on securities sales 1,531 2,255 2,071 8,075
Non-cash impairment charges        
Other-than-temporary securities impairment   (1,581)   (4,344)
Portion of other-than-temporary impairment recognized in other comprehensive income   447   447
Net non-cash impairment charges   (1,134)   (3,897)
Net realized gains 1,531 1,121 2,071 4,178
Income Tax Expense Benefit [Member]
       
Non-cash impairment charges        
Income tax expense on net realized gains 636 437 847 1,629
Gains Losses [Member]
       
Non-cash impairment charges        
Trading gains (losses), net (1) $ (2) [1] $ (1,022) [1] $ 742 [1] $ (561) [1]
[1] All trading gains relate to trading securities still held as of June 30, 2011.