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Note 4 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position (USD $)
In Thousands, unless otherwise specified
Sep. 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 $ 63,171 $ 210,707
Less than 12 Months Unrealized Losses 330 8,652
12 Months or Greater Estimated Fair Value 119,577 19,019
12 Months or Greater Unrealized Losses 3,741 883
Total Estimated Fair Value 182,748 229,726
Total Unrealized Losses 4,071 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 4,005 4,782
Less than 12 Months Unrealized Losses 16 148
12 Months or Greater Estimated Fair Value 4,702  
12 Months or Greater Unrealized Losses 81  
Total Estimated Fair Value 8,707 4,782
Total Unrealized Losses 97 148
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 55,857 155,475
Less than 12 Months Unrealized Losses 311 5,992
12 Months or Greater Estimated Fair Value 96,923 15,658
12 Months or Greater Unrealized Losses 3,413 683
Total Estimated Fair Value 152,780 171,133
Total Unrealized Losses 3,724 6,675
Equity Investment Other [Member]
    
Note 4 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
12 Months or Greater Estimated Fair Value   165
12 Months or Greater Unrealized Losses   12
Total Estimated Fair Value   165
Total Unrealized Losses   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 3,309 50,450
Less than 12 Months Unrealized Losses 3 2,512
12 Months or Greater Estimated Fair Value 17,952 3,196
12 Months or Greater Unrealized Losses 247 188
Total Estimated Fair Value 21,261 53,646
Total Unrealized Losses $ 250 $ 2,700