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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
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value $ 236,767 $ 332,315
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 2,998 5,191
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 112,224 94,664
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 7,050 $ 6,528
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 2 1
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 28,008 $ 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,841 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 28,008 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,841 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 0
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0 $ 0
Securities have been in a continuous unrealized loss position, number of positions 60 73
Securities have been in a continuous unrealized loss position, fair value $ 348,991 $ 426,979
Securities have been in a continuous unrealized loss position, unrealized losses $ 10,048 11,719
Municipal Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, less than 12 months, fair value   16,047
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses   64
Securities have been in a continuous unrealized loss position, 12 months or more, fair value   0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses   $ 0
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 1 1
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 20,192 $ 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,674 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 20,192 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,674 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 0
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 0 $ 0
Securities have been in a continuous unrealized loss position, number of positions   4
Securities have been in a continuous unrealized loss position, fair value   $ 16,047
Securities have been in a continuous unrealized loss position, unrealized losses   64
Other Debt Obligations [Member]    
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 9,475 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 525 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 93,716 298
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 6,284 $ 2
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 1  
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 20,192  
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,674  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 20,192  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,674  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 0  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0  
Securities have been in a continuous unrealized loss position, number of positions 14 1
Securities have been in a continuous unrealized loss position, fair value $ 103,191 $ 298
Securities have been in a continuous unrealized loss position, unrealized losses 6,809 2
FNMA [Member]    
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 47,153 74,972
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 605 1,250
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 5,673 5,952
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 210 $ 355
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 1  
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 7,816  
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 167  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 7,816  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 167  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 0  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0  
Securities have been in a continuous unrealized loss position, number of positions 14 18
Securities have been in a continuous unrealized loss position, fair value $ 52,826 $ 80,924
Securities have been in a continuous unrealized loss position, unrealized losses 815 1,605
Corporate Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 9,475 28,476
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 525 1,524
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 93,716 74,434
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 6,284 $ 5,566
Securities have been in a continuous unrealized loss position, number of positions 14 14
Securities have been in a continuous unrealized loss position, fair value $ 103,191 $ 102,910
Securities have been in a continuous unrealized loss position, unrealized losses 6,809 7,090
Collateralized Mortgage Backed Securities [Member]    
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 227,292 287,792
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 2,473 3,603
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 18,508 19,932
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 766 $ 960
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 1  
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 7,816  
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 167  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 7,816  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 167  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 0  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0  
Securities have been in a continuous unrealized loss position, number of positions 46 54
Securities have been in a continuous unrealized loss position, fair value $ 245,800 $ 307,724
Securities have been in a continuous unrealized loss position, unrealized losses 3,239 4,563
Available for Sale Securities Excluding Mortgage Backed Securities [Member]    
Securities have been in a continuous unrealized loss position, less than 12 months, fair value   44,523
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses   1,588
Securities have been in a continuous unrealized loss position, 12 months or more, fair value   74,732
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses   $ 5,568
Securities have been in a continuous unrealized loss position, number of positions   19
Securities have been in a continuous unrealized loss position, fair value   $ 119,255
Securities have been in a continuous unrealized loss position, unrealized losses   7,156
REMIC and CMO [Member]    
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 176,158 208,827
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,815 2,268
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 12,835 13,980
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 556 $ 605
Securities have been in a continuous unrealized loss position, number of positions 31 35
Securities have been in a continuous unrealized loss position, fair value $ 188,993 $ 222,807
Securities have been in a continuous unrealized loss position, unrealized losses 2,371 2,873
FHLMC [Member]    
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 3,981 3,993
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 53 85
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0 $ 0
Securities have been in a continuous unrealized loss position, number of positions 1 1
Securities have been in a continuous unrealized loss position, fair value $ 3,981 $ 3,993
Securities have been in a continuous unrealized loss position, unrealized losses $ 53 $ 85