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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 ($) | Dec. 31, 2017 USD ($)
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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 | $ 27,513 | $ 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

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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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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