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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
Mar. 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 $ 27,513 $ 28,654
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 2,324 1,187
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 7,564 28,654
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 404 1,187
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 19,949
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 1,920 $ 0
Securities have been in a continuous unrealized loss position, number of positions 85 69
Securities have been in a continuous unrealized loss position, fair value $ 584,139 $ 519,702
Securities have been in a continuous unrealized loss position, unrealized losses 21,217 12,583
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 394,958 325,020
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 8,952 2,827
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 189,181 194,682
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 12,265 $ 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 $ 19,949 $ 20,844
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,920 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 19,949 0
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 1,920 $ 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 $ 5,107  
Securities have been in a continuous unrealized loss position, unrealized losses 31  
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 5,107  
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 31  
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 $ 19,949 $ 20,844
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 1,920 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 19,949
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 1,920
Securities have been in a continuous unrealized loss position, number of positions 17 14
Securities have been in a continuous unrealized loss position, fair value $ 106,685 $ 102,767
Securities have been in a continuous unrealized loss position, unrealized losses 8,453 7,233
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 14,576 9,723
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 562 277
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 92,109 93,044
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 7,891 $ 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 $ 7,564 $ 7,810
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 404 163
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 7,564 7,810
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 404 163
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 20 17
Securities have been in a continuous unrealized loss position, fair value $ 126,645 $ 120,510
Securities have been in a continuous unrealized loss position, unrealized losses 3,451 1,054
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 116,149 109,258
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 2,971 850
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 10,496 11,252
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 480 $ 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 $ 7,564 $ 7,810
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 404 163
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 7,564 7,810
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 404 163
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 68 55
Securities have been in a continuous unrealized loss position, fair value $ 477,454 $ 416,935
Securities have been in a continuous unrealized loss position, unrealized losses 12,764 5,350
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 380,382 315,297
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 8,390 2,550
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 97,072 101,638
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 4,374 $ 2,800
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 $ 101,578 $ 102,767
Securities have been in a continuous unrealized loss position, unrealized losses 8,422 7,233
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 9,469 9,723
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 531 277
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 92,109 93,044
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 7,891 $ 6,956
REMIC and CMO [Member]    
Securities have been in a continuous unrealized loss position, number of positions 46 36
Securities have been in a continuous unrealized loss position, fair value $ 306,808 $ 249,596
Securities have been in a continuous unrealized loss position, unrealized losses 8,234 3,961
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 223,172 162,781
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 4,458 1,406
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 83,636 86,815
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 3,776 $ 2,555
FHLMC [Member]    
Securities have been in a continuous unrealized loss position, number of positions 2 2
Securities have been in a continuous unrealized loss position, fair value $ 44,001 $ 46,829
Securities have been in a continuous unrealized loss position, unrealized losses 1,079 335
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 41,061 43,258
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 961 294
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 2,940 3,571
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 118 $ 41