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Note 6 - Debt and Equity Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
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 $ 28,654 $ 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,187 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 28,654 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,187 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value
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 69 73
Securities have been in a continuous unrealized loss position, fair value $ 519,702 $ 426,979
Securities have been in a continuous unrealized loss position, unrealized losses 12,583 11,719
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 325,020 332,315
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 2,827 5,191
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 194,682 94,664
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 9,756 $ 6,528
Municipal Debt Securities [Member]    
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 $ 20,844 $ 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,024 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 20,844 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,024 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
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  
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses  
Other Debt Obligations [Member]    
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 $ 20,844  
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,024  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 20,844  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,024  
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 $ 102,767 $ 298
Securities have been in a continuous unrealized loss position, unrealized losses 7,233 2
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 9,723 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 277 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 93,044 298
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 6,956 $ 2
FNMA [Member]    
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 $ 7,810  
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 163  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 7,810  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 163  
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 17 18
Securities have been in a continuous unrealized loss position, fair value $ 120,510 $ 80,924
Securities have been in a continuous unrealized loss position, unrealized losses 1,054 1,605
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 109,258 74,972
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 850 1,250
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 11,252 5,952
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 204 $ 355
Corporate Debt Securities [Member]    
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 $ 102,767 $ 102,910
Securities have been in a continuous unrealized loss position, unrealized losses 7,233 7,090
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 9,723 28,476
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 277 1,524
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 93,044 74,434
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 6,956 $ 5,566
Collateralized Mortgage Backed Securities [Member]    
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 $ 7,810  
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 163  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 7,810  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 163  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses  
Securities have been in a continuous unrealized loss position, number of positions 55 54
Securities have been in a continuous unrealized loss position, fair value $ 416,935 $ 307,724
Securities have been in a continuous unrealized loss position, unrealized losses 5,350 4,563
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 315,297 287,792
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 2,550 3,603
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 101,638 19,932
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 2,800 $ 960
Available for Sale Securities Excluding Mortgage Backed Securities [Member]    
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
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
REMIC and CMO [Member]    
Securities have been in a continuous unrealized loss position, number of positions 36 35
Securities have been in a continuous unrealized loss position, fair value $ 249,596 $ 222,807
Securities have been in a continuous unrealized loss position, unrealized losses 3,961 2,873
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 162,781 208,827
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,406 2,268
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 86,815 13,980
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 2,555 $ 605
FHLMC [Member]    
Securities have been in a continuous unrealized loss position, number of positions 2 1
Securities have been in a continuous unrealized loss position, fair value $ 46,829 $ 3,993
Securities have been in a continuous unrealized loss position, unrealized losses 335 85
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 43,258 3,993
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 294 85
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 3,571 0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 41 $ 0