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Note 6 - Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 2 2
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 27,306 $ 28,654
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 2,144 1,187
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 28,654
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,187
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 27,306
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 2,144 $ 0
Securities have been in a continuous unrealized loss position, number of positions 87 69
Securities have been in a continuous unrealized loss position, fair value $ 589,648 $ 519,702
Securities have been in a continuous unrealized loss position, unrealized losses 24,131 12,583
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 143,932 325,020
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 2,845 2,827
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 445,716 194,682
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 21,286 $ 9,756
US States and Political Subdivisions 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 $ 19,940 $ 20,844
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,557 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 19,940 0
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 1,557 $ 0
Securities have been in a continuous unrealized loss position, number of positions 3  
Securities have been in a continuous unrealized loss position, fair value $ 4,220  
Securities have been in a continuous unrealized loss position, unrealized losses  
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 4,220  
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses  
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 1
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 19,940 $ 20,844
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,557 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 19,940
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 1,557
Securities have been in a continuous unrealized loss position, number of positions 30 14
Securities have been in a continuous unrealized loss position, fair value $ 209,507 $ 102,767
Securities have been in a continuous unrealized loss position, unrealized losses 13,110 7,233
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 110,085 9,723
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 2,533 277
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 99,422 93,044
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 10,577 $ 6,956
FNMA [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 $ 7,366 $ 7,810
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 587 163
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 7,366
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 587
Securities have been in a continuous unrealized loss position, number of positions 14 17
Securities have been in a continuous unrealized loss position, fair value $ 85,046 $ 120,510
Securities have been in a continuous unrealized loss position, unrealized losses 2,448 1,054
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 6,372 109,258
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 17 850
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 78,674 11,252
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 2,431 $ 204
Collateralized Mortgage Backed 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 $ 7,366 $ 7,810
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 587 163
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 7,366
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 587
Securities have been in a continuous unrealized loss position, number of positions 57 55
Securities have been in a continuous unrealized loss position, fair value $ 380,141 $ 416,935
Securities have been in a continuous unrealized loss position, unrealized losses 11,021 5,350
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 33,847 315,297
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 312 2,550
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 346,294 101,638
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 10,709 $ 2,800
Corporate Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 16 14
Securities have been in a continuous unrealized loss position, fair value $ 118,535 $ 102,767
Securities have been in a continuous unrealized loss position, unrealized losses 11,465 7,233
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 19,113 9,723
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 888 277
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 99,422 93,044
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 10,577 $ 6,956
Collateralized Loan Obligations [Member]    
Securities have been in a continuous unrealized loss position, number of positions 11  
Securities have been in a continuous unrealized loss position, fair value $ 86,752  
Securities have been in a continuous unrealized loss position, unrealized losses 1,645  
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 86,752  
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,645  
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  
REMIC and CMO [Member]    
Securities have been in a continuous unrealized loss position, number of positions 39 36
Securities have been in a continuous unrealized loss position, fair value $ 243,756 $ 249,596
Securities have been in a continuous unrealized loss position, unrealized losses 7,177 3,961
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 17,308 162,781
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 200 1,406
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 226,448 86,815
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 6,977 $ 2,555
FHLMC [Member]    
Securities have been in a continuous unrealized loss position, number of positions 3 2
Securities have been in a continuous unrealized loss position, fair value $ 51,288 $ 46,829
Securities have been in a continuous unrealized loss position, unrealized losses 1,396 335
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 10,116 43,258
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 95 294
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 41,172 3,571
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 1,301 $ 41
GNMA [Member]    
Securities have been in a continuous unrealized loss position, number of positions 1  
Securities have been in a continuous unrealized loss position, fair value $ 51  
Securities have been in a continuous unrealized loss position, unrealized losses  
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 51  
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses  
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