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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 ($) | Dec. 31, 2017 USD ($)
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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 |  |

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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