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Note 4 - Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details) $ in Thousands | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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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 | $ 28,822 | $ 27,306
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 479 | 2,144
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value |  |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  |
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value | 28,822 | 27,306
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 479 | $ 2,144
Securities have been in a continuous unrealized loss position, number of positions | 78 | 87
Securities have been in a continuous unrealized loss position, fair value | $ 551,633 | $ 589,648
Securities have been in a continuous unrealized loss position, unrealized losses | 17,311 | 24,131
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 135,231 | 143,932
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,773 | 2,845
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 416,402 | 445,716
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 15,538 | $ 21,286
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 | $ 21,096 | $ 19,940
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 256 | 1,557
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value |  |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  |
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value | 21,096 | 19,940
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 256 | $ 1,557
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 | $ 21,096 | $ 19,940
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 256 | 1,557
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value |  |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  |
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value | 21,096 | 19,940
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 256 | $ 1,557
Securities have been in a continuous unrealized loss position, number of positions | 27 | 30
Securities have been in a continuous unrealized loss position, fair value | $ 207,278 | $ 209,507
Securities have been in a continuous unrealized loss position, unrealized losses | 9,634 | 13,110
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 105,315 | 110,085
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,597 | 2,533
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 101,963 | 99,422
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 8,037 | $ 10,577
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 | $ 7,726 | $ 7,366
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 223 | 587
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value |  |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  |
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value | 7,726 | 7,366
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 223 | $ 587
Securities have been in a continuous unrealized loss position, number of positions | 12 | 14
Securities have been in a continuous unrealized loss position, fair value | $ 77,992 | $ 85,046
Securities have been in a continuous unrealized loss position, unrealized losses | 1,465 | 2,448
Securities have been in a continuous unrealized loss position, less than 12 months, fair value |  | 6,372
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  | 17
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 77,992 | 78,674
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 1,465 | $ 2,431
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 | $ 7,726 | $ 7,366
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 223 | 587
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value |  |
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  |
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value | 7,726 | 7,366
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 223 | $ 587
Securities have been in a continuous unrealized loss position, number of positions | 51 | 57
Securities have been in a continuous unrealized loss position, fair value | $ 344,355 | $ 380,141
Securities have been in a continuous unrealized loss position, unrealized losses | 7,677 | 11,021
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 29,916 | 33,847
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 176 | 312
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 314,439 | 346,294
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 7,501 | $ 10,709
Corporate Debt Securities [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 16 | 16
Securities have been in a continuous unrealized loss position, fair value | $ 121,382 | $ 118,535
Securities have been in a continuous unrealized loss position, unrealized losses | 8,618 | 11,465
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 19,419 | 19,113
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 581 | 888
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 101,963 | 99,422
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 8,037 | $ 10,577
Collateralized Loan Obligations [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 11 | 11
Securities have been in a continuous unrealized loss position, fair value | $ 85,896 | $ 86,752
Securities have been in a continuous unrealized loss position, unrealized losses | 1,016 | 1,645
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 85,896 | 86,752
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,016 | 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 | 36 | 39
Securities have been in a continuous unrealized loss position, fair value | $ 215,761 | $ 243,756
Securities have been in a continuous unrealized loss position, unrealized losses | 5,351 | 7,177
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 20,259 | 17,308
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 79 | 200
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 195,502 | 226,448
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 5,272 | $ 6,977
FHLMC [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 3 | 3
Securities have been in a continuous unrealized loss position, fair value | $ 50,602 | $ 51,288
Securities have been in a continuous unrealized loss position, unrealized losses | 861 | 1,396
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 9,657 | 10,116
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 97 | 95
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 40,945 | 41,172
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 764 | $ 1,301
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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: 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=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 + 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=118939692&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=118939692&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position. + References Reference 1: 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=118939692&loc=d3e27290-111563 + Details
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