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Note 3 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Held-to-Maturity |  |
Held-to-maturity, less than 12 months, estimated fair value | $ 57,731 | $ 149,666
Held-to-maturity, less than 12 months, gross unrealized losses | 251 | 1,187
Held-to-maturity, 12 months or more, estimated fair value | 43,611 | 21,754
Held-to-maturity, 12 months or more, gross unrealized losses | 486 | 86
Held-to-maturity, total, estimated fair value | 101,342 | 171,420
Held-to-maturity, total, gross unrealized losses | 737 | 1,273
Available-for-Sale |  |
Available-for-sale, less than 12 months, estimated fair value | 627,807 | 1,054,739
Available-for-sale, less than 12 months, gross unrealized losses | 5,639 | 25,409
Available-for-sale, 12 months or more, estimated fair value | 710,574 |
Available-for-sale, 12 months or more, gross unrealized losses | 19,268 |
Available-for-sale, total, estimated fair value | 1,338,381 | 1,054,739
Available-for-sale, total, gross unrealized losses | 24,907 | 25,409
US Government Agencies Debt Securities [Member] |  |
Held-to-Maturity |  |
Held-to-maturity, less than 12 months, estimated fair value | 11,961 | 32,859
Held-to-maturity, less than 12 months, gross unrealized losses | 6 | 141
Held-to-maturity, 12 months or more, estimated fair value | 32,778 | 19,959
Held-to-maturity, 12 months or more, gross unrealized losses | 222 | 41
Held-to-maturity, total, estimated fair value | 44,739 | 52,818
Held-to-maturity, total, gross unrealized losses | 228 | 182
Available-for-Sale |  |
Available-for-sale, less than 12 months, estimated fair value | 91,988 | 126,325
Available-for-sale, less than 12 months, gross unrealized losses | 921 | 2,301
Available-for-sale, 12 months or more, estimated fair value | 25,742 |
Available-for-sale, 12 months or more, gross unrealized losses | 1,030 |
Available-for-sale, total, estimated fair value | 117,730 | 126,325
Available-for-sale, total, gross unrealized losses | 1,951 | 2,301
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity |  |
Held-to-maturity, less than 12 months, estimated fair value | 5,471 | 11,833
Held-to-maturity, less than 12 months, gross unrealized losses | 47 | 205
Held-to-maturity, 12 months or more, estimated fair value | 8,946 | 1,465
Held-to-maturity, 12 months or more, gross unrealized losses | 240 | 44
Held-to-maturity, total, estimated fair value | 14,417 | 13,298
Held-to-maturity, total, gross unrealized losses | 287 | 249
Available-for-Sale |  |
Available-for-sale, less than 12 months, estimated fair value | 510,770 | 833,393
Available-for-sale, less than 12 months, gross unrealized losses | 4,516 | 17,637
Available-for-sale, 12 months or more, estimated fair value | 609,329 |
Available-for-sale, 12 months or more, gross unrealized losses | 16,430 |
Available-for-sale, total, estimated fair value | 1,120,099 | 833,393
Available-for-sale, total, gross unrealized losses | 20,946 | 17,637
US States and Political Subdivisions Debt Securities [Member] |  |
Held-to-Maturity |  |
Held-to-maturity, less than 12 months, estimated fair value | 40,299 | 104,974
Held-to-maturity, less than 12 months, gross unrealized losses | 198 | 841
Held-to-maturity, 12 months or more, estimated fair value | 1,887 | 330
Held-to-maturity, 12 months or more, gross unrealized losses | 24 | 1
Held-to-maturity, total, estimated fair value | 42,186 | 105,304
Held-to-maturity, total, gross unrealized losses | 222 | 842
Available-for-Sale |  |
Available-for-sale, less than 12 months, estimated fair value | 25,049 | 94,922
Available-for-sale, less than 12 months, gross unrealized losses | 202 | 5,469
Available-for-sale, 12 months or more, estimated fair value | 75,404 |
Available-for-sale, 12 months or more, gross unrealized losses | 1,807 |
Available-for-sale, total, estimated fair value | 100,453 | 94,922
Available-for-sale, total, gross unrealized losses | 2,009 | 5,469
Other Securities [Member] |  |
Available-for-Sale |  |
Available-for-sale, less than 12 months, estimated fair value |  | 99
Available-for-sale, less than 12 months, gross unrealized losses |  | 2
Available-for-sale, 12 months or more, estimated fair value | 99 |
Available-for-sale, 12 months or more, gross unrealized losses | 1 |
Available-for-sale, total, estimated fair value | 99 | 99
Available-for-sale, total, gross unrealized losses | $ 1 | $ 2

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