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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, 2017 USD ($) | Dec. 31, 2016 USD ($)
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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 | $ 19,612 | $ 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 2,254 | 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 19,612 | 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 2,254 | 2,327
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 | $ 0
Securities have been in a continuous unrealized loss position, number of positions | 67 | 73
Securities have been in a continuous unrealized loss position, fair value | $ 391,849 | $ 426,979
Securities have been in a continuous unrealized loss position, fair value | 10,977 | 11,719
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 287,537 | 332,315
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 4,479 | 5,191
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 104,312 | 94,664
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 6,498 | $ 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 | $ 19,612 | $ 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 2,254 | 2,327
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 19,612 | 19,538
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 2,254 | 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, fair value |  | 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, 12 months or more, 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
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 | $ 103,694 | $ 102,910
Securities have been in a continuous unrealized loss position, fair value | 6,306 | 7,090
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 19,209 | 28,476
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 791 | 1,524
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 84,485 | 74,434
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 5,515 | $ 5,566
Other Debt Obligations [Member] |  |
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 | $ 299 | $ 298
Securities have been in a continuous unrealized loss position, fair value | 2 | 2
Securities have been in a continuous unrealized loss position, less than 12 months, 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, 12 months or more, fair value | 299 | 298
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 2 | $ 2
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 15 | 19
Securities have been in a continuous unrealized loss position, fair value | $ 103,993 | $ 119,255
Securities have been in a continuous unrealized loss position, fair value | 6,308 | 7,156
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 19,209 | 44,523
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 791 | 1,588
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 84,784 | 74,732
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 5,517 | $ 5,568
REMIC and CMO [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 34 | 35
Securities have been in a continuous unrealized loss position, fair value | $ 208,825 | $ 222,807
Securities have been in a continuous unrealized loss position, fair value | 3,154 | 2,873
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 195,016 | 208,827
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 2,516 | 2,268
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 13,809 | 13,980
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 638 | $ 605
FNMA [Member] |  |
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 | $ 75,059 | $ 80,924
Securities have been in a continuous unrealized loss position, fair value | 1,432 | 1,605
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 69,340 | 74,972
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 1,089 | 1,250
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 5,719 | 5,952
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 343 | $ 355
FHLMC [Member] |  |
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 | $ 3,972 | $ 3,993
Securities have been in a continuous unrealized loss position, fair value | 83 | 85
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 3,972 | 3,993
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 83 | 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
Collateralized Mortgage Backed Securities [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 52 | 54
Securities have been in a continuous unrealized loss position, fair value | $ 287,856 | $ 307,724
Securities have been in a continuous unrealized loss position, fair value | 4,669 | 4,563
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 268,328 | 287,792
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 3,688 | 3,603
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 19,528 | 19,932
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 981 | $ 960

X
- 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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