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Note 4 - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Corporate Debt Securities [Member]    
Count 11 12
Fair Value $ 74,813 $ 85,563
Unrealized Losses 5,186 4,436
Less Than 12 Months - Fair Value 56,128 76,218
Less Than 12 Months - Unrealized Losses 3,871 3,782
12 Months or More - Fair Value 18,685 9,345
12 Months or More - Unrealized Losses $ 1,315 $ 654
Collateralized Debt Obligations [Member]    
Count 9 7
Fair Value $ 72,328 $ 52,898
Unrealized Losses 720 327
Less Than 12 Months - Fair Value 72,328 52,898
Less Than 12 Months - Unrealized Losses $ 720 $ 327
12 Months or More - Fair Value
12 Months or More - Unrealized Losses
Other Debt Obligations [Member]    
Count 1 1
Fair Value $ 296 $ 298
Unrealized Losses $ 4 $ 2
Less Than 12 Months - Fair Value
Less Than 12 Months - Unrealized Losses
12 Months or More - Fair Value $ 296 $ 298
12 Months or More - Unrealized Losses $ 4 $ 2
Available for Sale Securities Excluding Mortgage Backed Securities [Member]    
Count 21 20
Fair Value $ 147,437 $ 138,759
Unrealized Losses 5,910 4,765
Less Than 12 Months - Fair Value 128,456 129,116
Less Than 12 Months - Unrealized Losses 4,591 4,109
12 Months or More - Fair Value 18,981 9,643
12 Months or More - Unrealized Losses $ 1,319 $ 656
REMIC and CMO [Member]    
Count 10 33
Fair Value $ 49,379 $ 238,132
Unrealized Losses 590 3,147
Less Than 12 Months - Fair Value 13,733 182,010
Less Than 12 Months - Unrealized Losses 60 1,642
12 Months or More - Fair Value 35,646 56,122
12 Months or More - Unrealized Losses $ 530 $ 1,505
GNMA [Member]    
Count 1 1
Fair Value $ 6,786 $ 6,977
Unrealized Losses $ 35 139
Less Than 12 Months - Fair Value 6,977
Less Than 12 Months - Unrealized Losses $ 139
12 Months or More - Fair Value $ 6,786
12 Months or More - Unrealized Losses $ 35
FNMA [Member]    
Count 4 20
Fair Value $ 26,415 $ 102,225
Unrealized Losses $ 261 1,762
Less Than 12 Months - Fair Value 75,769
Less Than 12 Months - Unrealized Losses 1,043
12 Months or More - Fair Value $ 26,415 26,456
12 Months or More - Unrealized Losses $ 261 $ 719
Collateralized Mortgage Backed Securities [Member]    
Count 15 57
Fair Value $ 82,580 $ 362,049
Unrealized Losses 886 5,147
Less Than 12 Months - Fair Value 13,733 279,471
Less Than 12 Months - Unrealized Losses 60 2,923
12 Months or More - Fair Value 68,847 82,578
12 Months or More - Unrealized Losses $ 826 $ 2,224
FHLMC [Member]    
Count   3
Fair Value   $ 14,715
Unrealized Losses   99
Less Than 12 Months - Fair Value   14,715
Less Than 12 Months - Unrealized Losses   $ 99
12 Months or More - Fair Value  
12 Months or More - Unrealized Losses  
Count 36 77
Fair Value $ 230,017 $ 500,808
Unrealized Losses 6,796 9,912
Less Than 12 Months - Fair Value 142,189 408,587
Less Than 12 Months - Unrealized Losses 4,651 7,032
12 Months or More - Fair Value 87,828 92,221
12 Months or More - Unrealized Losses $ 2,145 $ 2,880