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Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value $ 424,092 $ 374,858
Unrealized Losses 8,106 7,259
Less Than 12 Months - Fair Value 273,879 97,274
Less Than 12 Months - Unrealized Losses 4,087 846
12 Months or More - Fair Value 150,213 277,584
12 Months or More - Unrealized Losses 4,019 6,413
Corporate Debt Securities [Member]    
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value 53,275 39,287
Unrealized Losses 1,725 714
Less Than 12 Months - Fair Value 38,413 9,573
Less Than 12 Months - Unrealized Losses 1,587 428
12 Months or More - Fair Value 14,862 29,714
12 Months or More - Unrealized Losses 138 286
Municipals Debt Securities [Member]    
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value 17,077 8,810
Unrealized Losses 130 61
Less Than 12 Months - Fair Value 17,077 3,546
Less Than 12 Months - Unrealized Losses 130 11
12 Months or More - Fair Value   5,264
12 Months or More - Unrealized Losses   50
Other Debt Obligations [Member]    
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value 298 292
Unrealized Losses 2 8
Less Than 12 Months - Fair Value 298  
Less Than 12 Months - Unrealized Losses 2  
12 Months or More - Fair Value   292
12 Months or More - Unrealized Losses   8
Available For Sale Securities, Excluding Mortgage-Backed Securities [Member]    
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value 70,650 48,389
Unrealized Losses 1,857 783
Less Than 12 Months - Fair Value 55,788 13,119
Less Than 12 Months - Unrealized Losses 1,719 439
12 Months or More - Fair Value 14,862 35,270
12 Months or More - Unrealized Losses 138 344
REMIC And CMO [Member]    
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value 245,107 216,190
Unrealized Losses 4,187 4,627
Less Than 12 Months - Fair Value 141,760 77,382
Less Than 12 Months - Unrealized Losses 1,205 399
12 Months or More - Fair Value 103,347 138,808
12 Months or More - Unrealized Losses 2,982 4,228
GNMA [Member]    
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value 7,727 8,358
Unrealized Losses 123 124
Less Than 12 Months - Fair Value 7,727  
Less Than 12 Months - Unrealized Losses 123  
12 Months or More - Fair Value   8,358
12 Months or More - Unrealized Losses   124
FNMA [Member]    
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value 100,608 95,148
Unrealized Losses 1,939 1,717
Less Than 12 Months - Fair Value 68,604  
Less Than 12 Months - Unrealized Losses 1,040  
12 Months or More - Fair Value 32,004 95,148
12 Months or More - Unrealized Losses 899 1,717
Collateralized Mortgage Backed Securities [Member]    
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value 353,442 326,469
Unrealized Losses 6,249 6,476
Less Than 12 Months - Fair Value 218,091 84,155
Less Than 12 Months - Unrealized Losses 2,368 407
12 Months or More - Fair Value 135,351 242,314
12 Months or More - Unrealized Losses $ 3,881 6,069
FHLMC [Member]    
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]    
Fair Value   6,773
Unrealized Losses   8
Less Than 12 Months - Fair Value   6,773
Less Than 12 Months - Unrealized Losses   $ 8