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Note 3 - Investment Securities - Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Held-to-maturity, less than 12 months, estimated fair value | $ 149,666 | $ 143,582
Held-to-maturity, less than 12 months, gross unrealized losses | 1,187 | 761
Held-to-maturity, 12 months or more, estimated fair value | 21,754 | 91,256
Held-to-maturity, 12 months or more, gross unrealized losses | 86 | 1,047
Held-to-maturity, total, estimated fair value | 171,420 | 234,838
Held-to-maturity, total, gross unrealized losses | 1,273 | 1,808
Available-for-sale, less than 12 months, estimated fair value | 1,054,739 | 590,993
Available-for-sale, less than 12 months, gross unrealized losses | 25,409 | 4,590
Available-for-sale, 12 months or more, estimated fair value |  | 46,533
Available-for-sale, 12 months or more, gross unrealized losses |  | 582
Available-for-sale, total, estimated fair value | 1,054,739 | 637,526
Available-for-sale, total, gross unrealized losses | 25,409 | 5,172
US Government Agencies Debt Securities [Member] |  |
Held-to-maturity, less than 12 months, estimated fair value | 32,859 | 107,758
Held-to-maturity, less than 12 months, gross unrealized losses | 141 | 567
Held-to-maturity, 12 months or more, estimated fair value | 19,959 | 79,166
Held-to-maturity, 12 months or more, gross unrealized losses | 41 | 828
Held-to-maturity, total, estimated fair value | 52,818 | 186,924
Held-to-maturity, total, gross unrealized losses | 182 | 1,395
Available-for-sale, less than 12 months, estimated fair value | 126,325 | 62,473
Available-for-sale, less than 12 months, gross unrealized losses | 2,301 | 317
Available-for-sale, 12 months or more, estimated fair value |  | 46,023
Available-for-sale, 12 months or more, gross unrealized losses |  | 581
Available-for-sale, total, estimated fair value | 126,325 | 108,496
Available-for-sale, total, gross unrealized losses | 2,301 | 898
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-maturity, less than 12 months, estimated fair value | 11,833 | 7,958
Held-to-maturity, less than 12 months, gross unrealized losses | 205 | 94
Held-to-maturity, 12 months or more, estimated fair value | 1,465 | 8,144
Held-to-maturity, 12 months or more, gross unrealized losses | 44 | 196
Held-to-maturity, total, estimated fair value | 13,298 | 16,102
Held-to-maturity, total, gross unrealized losses | 249 | 290
Available-for-sale, less than 12 months, estimated fair value | 833,393 | 523,185
Available-for-sale, less than 12 months, gross unrealized losses | 17,637 | 4,130
Available-for-sale, 12 months or more, estimated fair value |  |
Available-for-sale, 12 months or more, gross unrealized losses |  |
Available-for-sale, total, estimated fair value | 833,393 | 523,185
Available-for-sale, total, gross unrealized losses | 17,637 | 4,130
US States and Political Subdivisions Debt Securities [Member] |  |
Held-to-maturity, less than 12 months, estimated fair value | 104,974 | 27,866
Held-to-maturity, less than 12 months, gross unrealized losses | 841 | 100
Held-to-maturity, 12 months or more, estimated fair value | 330 | 3,946
Held-to-maturity, 12 months or more, gross unrealized losses | 1 | 23
Held-to-maturity, total, estimated fair value | 105,304 | 31,812
Held-to-maturity, total, gross unrealized losses | 842 | 123
Available-for-sale, less than 12 months, estimated fair value | 94,922 | 281
Available-for-sale, less than 12 months, gross unrealized losses | 5,469 |
Available-for-sale, 12 months or more, estimated fair value |  |
Available-for-sale, 12 months or more, gross unrealized losses |  |
Available-for-sale, total, estimated fair value | 94,922 | 281
Available-for-sale, total, gross unrealized losses | 5,469 |
Other Securities [Member] |  |
Available-for-sale, less than 12 months, estimated fair value | 99 | 1,060
Available-for-sale, less than 12 months, gross unrealized losses | 2 | 137
Available-for-sale, 12 months or more, estimated fair value |  | 510
Available-for-sale, 12 months or more, gross unrealized losses |  | 1
Available-for-sale, total, estimated fair value | 99 | 1,570
Available-for-sale, total, gross unrealized losses | $ 2 | 138
US Treasury Securities [Member] |  |
Available-for-sale, less than 12 months, estimated fair value |  | 3,994
Available-for-sale, less than 12 months, gross unrealized losses |  | 6
Available-for-sale, 12 months or more, estimated fair value |  |
Available-for-sale, 12 months or more, gross unrealized losses |  |
Available-for-sale, total, estimated fair value |  | 3,994
Available-for-sale, total, gross unrealized losses |  | $ 6

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a 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=73527792&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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=73527792&loc=d3e27290-111563 + Details
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