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Note 7 - Fair Value Measurements (Detail) - Fair Values Of Company's Financial Instruments (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Assets      
Amount $ 6,780 $ 5,374 $ 5,914
Fair Value 6,780 5,374  
Amount 4,173 21,785 22,088
Fair Value 4,173 21,785 22,088
Amount 46,752 205,252 718,848
Fair Value 46,752 205,252 718,848
Amount 296,363 313,811 292,257
Fair Value 296,363 313,811  
Amount 12,031 10,242  
Fair Value 12,031 10,242  
Amount 171,241 176,826 107,907
Fair Value 171,241 176,826  
Amount 2,397,669 2,056,256 2,029,645
Fair Value 2,392,049 2,056,047  
Amount 14,036 13,743 13,643
Fair Value 14,036 13,743 13,643
Amount 2,514,989 2,392,095 2,747,349
Amount 124,668 152,662  
Fair Value 149,753 155,452  
Fair Value, Inputs, Level 1 [Member]
     
Assets      
Fair Value 126 81  
Fair Value, Inputs, Level 2 [Member] | Interest-bearing Deposits [Member]
     
Assets      
Fair Value 796,654 688,506  
Fair Value, Inputs, Level 2 [Member] | Noninterest-bearing Deposits [Member]
     
Assets      
Fair Value 1,721,389 1,707,978  
Fair Value, Inputs, Level 2 [Member]
     
Assets      
Fair Value 6,780 5,374  
Amount 4,173 21,785  
Fair Value 4,173 21,785  
Amount 46,752 205,252  
Fair Value 46,752 205,252  
Fair Value 296,008 313,504  
Fair Value 12,031 10,242  
Fair Value 171,241 176,826  
Amount 14,036 13,743  
Fair Value 14,036 13,743  
Fair Value 149,753 155,452  
Fair Value, Inputs, Level 3 [Member]
     
Assets      
Fair Value 229 226  
Fair Value 2,392,049 2,056,047  
Interest-bearing Deposits [Member]
     
Assets      
Amount 796,654 688,506  
Fair Value 796,654 688,506  
Noninterest-bearing Deposits [Member]
     
Assets      
Amount 1,718,335 1,703,589  
Fair Value $ 1,721,389 $ 1,707,978