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Note 4 - Debt and Equity Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Corporate Debt Securities [Member]    
Count 13 12
Fair Value $ 93,820 $ 85,563
Unrealized Losses 6,180 4,436
Less Than 12 Months - Fair Value 19,294 76,218
Less Than 12 Months - Unrealized Losses 706 3,782
12 Months or More - Fair Value 74,526 9,345
12 Months or More - Unrealized Losses $ 5,474 $ 654
Collateralized Debt Obligations [Member]    
Count 1 7
Fair Value $ 7,474 $ 52,898
Unrealized Losses 8 327
Less Than 12 Months - Fair Value 52,898
Less Than 12 Months - Unrealized Losses 327
12 Months or More - Fair Value 7,474
12 Months or More - Unrealized Losses $ 8
Other Debt Obligations [Member]    
Count 1 1
Fair Value $ 299 $ 298
Unrealized Losses 2 2
Less Than 12 Months - Fair Value
Less Than 12 Months - Unrealized Losses
12 Months or More - Fair Value 299 298
12 Months or More - Unrealized Losses $ 2 $ 2
Available for Sale Securities Excluding Mortgage Backed Securities [Member]    
Count 15 20
Fair Value $ 101,593 $ 138,759
Unrealized Losses 6,190 4,765
Less Than 12 Months - Fair Value 19,294 129,116
Less Than 12 Months - Unrealized Losses 706 4,109
12 Months or More - Fair Value 82,299 9,643
12 Months or More - Unrealized Losses $ 5,484 $ 656
REMIC and CMO [Member]    
Count 11 33
Fair Value $ 55,603 $ 238,132
Unrealized Losses 630 3,147
Less Than 12 Months - Fair Value 19,707 182,010
Less Than 12 Months - Unrealized Losses 131 1,642
12 Months or More - Fair Value 35,896 56,122
12 Months or More - Unrealized Losses $ 499 $ 1,505
FNMA [Member]    
Count 1 20
Fair Value $ 6,694 $ 102,225
Unrealized Losses 45 1,762
Less Than 12 Months - Fair Value 75,769
Less Than 12 Months - Unrealized Losses 1,043
12 Months or More - Fair Value 6,694 26,456
12 Months or More - Unrealized Losses $ 45 $ 719
GNMA [Member]    
Count   1
Fair Value   $ 6,977
Unrealized Losses   139
Less Than 12 Months - Fair Value   6,977
Less Than 12 Months - Unrealized Losses   139
12 Months or More - Fair Value  
12 Months or More - Unrealized Losses  
Collateralized Mortgage Backed Securities [Member]    
Count 12 57
Fair Value $ 62,297 $ 362,049
Unrealized Losses 675 5,147
Less Than 12 Months - Fair Value 19,707 279,471
Less Than 12 Months - Unrealized Losses 131 2,923
12 Months or More - Fair Value 42,590 82,578
12 Months or More - Unrealized Losses $ 544 $ 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 27 77
Fair Value $ 163,890 $ 500,808
Unrealized Losses 6,865 9,912
Less Than 12 Months - Fair Value 39,001 408,587
Less Than 12 Months - Unrealized Losses 837 7,032
12 Months or More - Fair Value 124,889 92,221
12 Months or More - Unrealized Losses $ 6,028 $ 2,880