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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

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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