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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 | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | ---
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | $ 236,767 | $ 332,315
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 2,998 | 5,191
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 112,224 | 94,664
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 7,050 | $ 6,528
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 | $ 28,008 | $ 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 1,841 | 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 28,008 | 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,841 | 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 | 60 | 73
Securities have been in a continuous unrealized loss position, fair value | $ 348,991 | $ 426,979
Securities have been in a continuous unrealized loss position, unrealized losses | $ 10,048 | 11,719
Municipal Debt Securities [Member] |  |
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 |  | 0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses |  | $ 0
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 | $ 20,192 | $ 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 1,674 | 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 20,192 | 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,674 | 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
Other Debt Obligations [Member] |  |
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 9,475 | 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 525 | 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 93,716 | 298
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 6,284 | $ 2
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 | $ 20,192 |
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 1,674 |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 20,192 |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,674 |
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 | $ 103,191 | $ 298
Securities have been in a continuous unrealized loss position, unrealized losses | 6,809 | 2
FNMA [Member] |  |
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 47,153 | 74,972
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 605 | 1,250
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 5,673 | 5,952
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 210 | $ 355
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 | $ 7,816 |
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 167 |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 7,816 |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 167 |
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 | 18
Securities have been in a continuous unrealized loss position, fair value | $ 52,826 | $ 80,924
Securities have been in a continuous unrealized loss position, unrealized losses | 815 | 1,605
Corporate Debt Securities [Member] |  |
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 9,475 | 28,476
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 525 | 1,524
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 93,716 | 74,434
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 6,284 | $ 5,566
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 | $ 103,191 | $ 102,910
Securities have been in a continuous unrealized loss position, unrealized losses | 6,809 | 7,090
Collateralized Mortgage Backed Securities [Member] |  |
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 227,292 | 287,792
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 2,473 | 3,603
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 18,508 | 19,932
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 766 | $ 960
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 | $ 7,816 |
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 167 |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 7,816 |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 167 |
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 | 46 | 54
Securities have been in a continuous unrealized loss position, fair value | $ 245,800 | $ 307,724
Securities have been in a continuous unrealized loss position, unrealized losses | 3,239 | 4,563
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
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
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
REMIC and CMO [Member] |  |
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 176,158 | 208,827
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,815 | 2,268
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 12,835 | 13,980
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 556 | $ 605
Securities have been in a continuous unrealized loss position, number of positions | 31 | 35
Securities have been in a continuous unrealized loss position, fair value | $ 188,993 | $ 222,807
Securities have been in a continuous unrealized loss position, unrealized losses | 2,371 | 2,873
FHLMC [Member] |  |
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 3,981 | 3,993
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 53 | 85
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 0 | 0
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 | 1 | 1
Securities have been in a continuous unrealized loss position, fair value | $ 3,981 | $ 3,993
Securities have been in a continuous unrealized loss position, unrealized losses | $ 53 | $ 85

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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 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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