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Note 3 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses And Fair Value (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Note 3 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses And Fair Value [Line Items]    
Less than 12 Months Estimated Fair Value $ 179,381 $ 51,955
Less than 12 Months Unrealized Losses 7,023 315
12 Months or Greater Estimated Fair Value 3,282 2,855
12 Months or Greater Unrealized Losses 103 98
Total Estimated Fair Value 182,663 54,810
Total Unrealized Losses 7,126 413
US Government Agencies Debt Securities [Member]
    
Note 3 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses And Fair Value [Line Items]    
Less than 12 Months Estimated Fair Value 4,787 2,999
Less than 12 Months Unrealized Losses 143 1
Total Estimated Fair Value 4,787 2,999
Total Unrealized Losses 143 1
Residential Mortgage Backed Securities [Member]
    
Note 3 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses And Fair Value [Line Items]    
Less than 12 Months Estimated Fair Value 133,938 44,992
Less than 12 Months Unrealized Losses 4,580 263
12 Months or Greater Estimated Fair Value 2,649 2,743
12 Months or Greater Unrealized Losses 69 33
Total Estimated Fair Value 136,587 47,735
Total Unrealized Losses 4,649 296
Equity Investment Other [Member]
    
Note 3 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses And Fair Value [Line Items]    
12 Months or Greater Estimated Fair Value 151 112
12 Months or Greater Unrealized Losses 26 65
Total Estimated Fair Value 151 112
Total Unrealized Losses 26 65
Municipal Bonds [Member]
    
Note 3 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses And Fair Value [Line Items]    
Less than 12 Months Estimated Fair Value 40,656 3,964
Less than 12 Months Unrealized Losses 2,300 51
12 Months or Greater Estimated Fair Value 482  
12 Months or Greater Unrealized Losses 8  
Total Estimated Fair Value 41,138 3,964
Total Unrealized Losses $ 2,308 $ 51