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Note 4 - Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Securities have been in a continuous unrealized loss position, number of positions |  | 87
Securities have been in a continuous unrealized loss position, fair value |  | $ 589,648,000
Securities have been in a continuous unrealized loss position, unrealized losses |  | 24,131,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value |  | 143,932,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  | 2,845,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value |  | 445,716,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses |  | $ 21,286,000
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions | 52 | 2
Held-to-maturity securities have been in a continuous unrealized loss position, fair value | $ 429,137,000 | $ 27,306,000
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 10,637,000 | 2,144,000
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 137,825,000 | 0
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,109,000 | 0
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value | 291,312,000 | 27,306,000
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 9,528,000 | $ 2,144,000
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 | $ 122,036,000 | $ 118,535,000
Securities have been in a continuous unrealized loss position, unrealized losses | 7,964,000 | 11,465,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 19,720,000 | 19,113,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 280,000 | 888,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 102,316,000 | 99,422,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 7,684,000 | $ 10,577,000
US States and Political Subdivisions Debt Securities [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions |  | 3
Securities have been in a continuous unrealized loss position, fair value |  | $ 4,220,000
Securities have been in a continuous unrealized loss position, unrealized losses |  | 0
Securities have been in a continuous unrealized loss position, less than 12 months, fair value |  | 4,220,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  | 0
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
Held-to-maturity securities have been in a continuous unrealized loss position, fair value |  | $ 19,940,000
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss |  | 1,557,000
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value |  | 0
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  | 0
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value |  | 19,940,000
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses |  | $ 1,557,000
Collateralized Loan Obligations [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 10 | 11
Securities have been in a continuous unrealized loss position, fair value | $ 80,046,000 | $ 86,752,000
Securities have been in a continuous unrealized loss position, unrealized losses | 734,000 | 1,645,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 80,046,000 | 86,752,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 734,000 | 1,645,000
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
Other Debt Obligations [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions |  | 30
Securities have been in a continuous unrealized loss position, fair value |  | $ 209,507,000
Securities have been in a continuous unrealized loss position, unrealized losses |  | 13,110,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value |  | 110,085,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  | 2,533,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value |  | 99,422,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses |  | $ 10,577,000
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions | 26 | 1
Held-to-maturity securities have been in a continuous unrealized loss position, fair value | $ 202,082,000 | $ 19,940,000
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 8,698,000 | 1,557,000
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 99,766,000 | 0
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,014,000 | 0
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value | 102,316,000 | 19,940,000
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 7,684,000 | $ 1,557,000
FNMA [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions |  | 14
Securities have been in a continuous unrealized loss position, fair value |  | $ 85,046,000
Securities have been in a continuous unrealized loss position, unrealized losses |  | 2,448,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value |  | 6,372,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  | 17,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value |  | 78,674,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses |  | $ 2,431,000
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions | 5 | 1
Held-to-maturity securities have been in a continuous unrealized loss position, fair value | $ 60,396,000 | $ 7,366,000
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 572,000 | 587,000
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 0 | 0
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value | 60,396,000 | 7,366,000
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 572,000 | $ 587,000
REMIC and CMO [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 19 | 39
Securities have been in a continuous unrealized loss position, fair value | $ 126,261,000 | $ 243,756,000
Securities have been in a continuous unrealized loss position, unrealized losses | 1,109,000 | 7,177,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 38,059,000 | 17,308,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 95,000 | 200,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 88,202,000 | 226,448,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 1,014,000 | $ 6,977,000
Collateralized Mortgage Backed Securities [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions |  | 57
Securities have been in a continuous unrealized loss position, fair value |  | $ 380,141,000
Securities have been in a continuous unrealized loss position, unrealized losses |  | 11,021,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value |  | 33,847,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  | 312,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value |  | 346,294,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses |  | $ 10,709,000
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions | 26 | 1
Held-to-maturity securities have been in a continuous unrealized loss position, fair value | $ 227,055,000 | $ 7,366,000
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss | 1,939,000 | 587,000
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value | 38,059,000 | 0
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 95,000 | 0
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value | 188,996,000 | 7,366,000
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 1,844,000 | $ 587,000
FHLMC [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 2 | 3
Securities have been in a continuous unrealized loss position, fair value | $ 40,398,000 | $ 51,288,000
Securities have been in a continuous unrealized loss position, unrealized losses | 258,000 | 1,396,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 0 | 10,116,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 95,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 40,398,000 | 41,172,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | $ 258,000 | $ 1,301,000
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 |  | $ 51,000
Securities have been in a continuous unrealized loss position, unrealized losses |  | 0
Securities have been in a continuous unrealized loss position, less than 12 months, fair value |  | 51,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses |  | 0
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

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 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, 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 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: 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 + Details
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- 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 less 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 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: 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 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 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 less 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 + Details
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- 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 unrealized loss position without allowance for credit loss. + 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 (a)(1) -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 (a)(1) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 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 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 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 (a)(2) -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 (a)(2) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 + 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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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months. + 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 Reference 2: 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 + Details
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