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Note 8 - Fair Value Measurements (Detail) - Fair Values Of Company's Financial Instruments (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Assets      
Carrying Value $ 7,123 $ 7,439 $ 5,838
Fair Value 7,123 7,439  
Carrying Value 5,811 7,852 18,990
Fair Value 5,811 7,852 18,990
Carrying Value 257,957 324,043 117,326
Fair Value 257,957 324,043 117,326
Carrying Value 318,431 299,820 345,021
Fair Value 318,431 299,820  
Carrying Value 11,154 10,694  
Fair Value 11,154 10,694  
Carrying Value 132,698 226,923 87,496
Fair Value 132,698 226,923  
Carrying Value 2,548,024 2,493,095 2,186,940
Fair Value 2,589,295 2,515,409  
Carrying Value 14,229 14,135 13,839
Fair Value 14,229 14,135 13,839
Liabilities      
Carrying Value 2,812,930 2,897,222 2,368,235
Carrying Value 131,964 140,638  
Fair Value 133,909 142,765  
Fair Value, Inputs, Level 1 [Member]
     
Assets      
Fair Value 120 112  
Fair Value, Inputs, Level 2 [Member] | Noninterest-bearing Deposits [Member]
     
Liabilities      
Fair Value 756,177 881,390  
Fair Value, Inputs, Level 2 [Member] | Interest-bearing Deposits [Member]
     
Liabilities      
Fair Value 2,057,317 2,017,623  
Fair Value, Inputs, Level 2 [Member]
     
Assets      
Fair Value 7,123 7,439  
Carrying Value 5,811 7,852  
Fair Value 5,811 7,852  
Carrying Value 257,957 324,043  
Fair Value 257,957 324,043  
Fair Value 318,082 299,478  
Fair Value 11,154 10,694  
Fair Value 132,698 226,923  
Fair Value 26,937 29,021  
Carrying Value 14,229 14,135  
Fair Value 14,229 14,135  
Liabilities      
Fair Value 133,909 142,765  
Fair Value, Inputs, Level 3 [Member]
     
Assets      
Fair Value 229 230  
Fair Value 2,562,358 2,486,388  
Noninterest-bearing Deposits [Member]
     
Liabilities      
Carrying Value 756,177 881,390  
Fair Value 756,177 881,390  
Interest-bearing Deposits [Member]
     
Liabilities      
Carrying Value 2,056,753 2,015,832  
Fair Value $ 2,057,317 $ 2,017,623