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Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value $ 34,818 $ 210,707
Less than 12 Months Unrealized Losses 181 8,652
12 Months or Greater Estimated Fair Value 125,375 19,019
12 Months or Greater Unrealized Losses 3,534 883
Total Estimated Fair Value 160,193 229,726
Total Unrealized Losses 3,715 9,535
US Government Agencies Debt Securities [Member]
   
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 2,015 4,782
Less than 12 Months Unrealized Losses 5 148
12 Months or Greater Estimated Fair Value 4,774  
12 Months or Greater Unrealized Losses 94  
Total Estimated Fair Value 6,789 4,782
Total Unrealized Losses 99 148
Residential Mortgage Backed Securities [Member]
   
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 25,330 155,475
Less than 12 Months Unrealized Losses 125 5,992
12 Months or Greater Estimated Fair Value 100,557 15,658
12 Months or Greater Unrealized Losses 2,976 683
Total Estimated Fair Value 125,887 171,133
Total Unrealized Losses 3,101 6,675
Equity Investment Other [Member]
   
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 169  
Less than 12 Months Unrealized Losses 9  
12 Months or Greater Estimated Fair Value   165
12 Months or Greater Unrealized Losses   12
Total Estimated Fair Value 169 165
Total Unrealized Losses 9 12
Municipal Bonds [Member]
   
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 7,304 50,450
Less than 12 Months Unrealized Losses 42 2,512
12 Months or Greater Estimated Fair Value 20,044 3,196
12 Months or Greater Unrealized Losses 464 188
Total Estimated Fair Value 27,348 53,646
Total Unrealized Losses $ 506 $ 2,700