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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Investment [Table Text Block] |
|  | Years Ended December 31
|  | 2017 |  | 2016
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 46,945 |  |  | $ | 7 |  |  | $ | (228 | ) |  | $ | 46,724 |  |  | $ | 76,875 |  |  | $ | 107 |  |  | $ | (182 | ) |  | $ | 76,800 |
Mortgage-backed securities |  |  | 16,132 |  |  |  | 8 |  |  |  | (287 | ) |  |  | 15,853 |  |  |  | 19,773 |  |  |  | 63 |  |  |  | (249 | ) |  |  | 19,587 |
State and political subdivisions |  |  | 301,491 |  |  |  | 5,962 |  |  |  | (222 | ) |  |  | 307,231 |  |  |  | 362,532 |  |  |  | 4,967 |  |  |  | (842 | ) |  |  | 366,657 |
Other securities |  |  | 3,490 |  |  |  | -- |  |  |  | -- |  |  |  | 3,490 |  |  |  | 2,916 |  |  |  | -- |  |  |  | -- |  |  |  | 2,916 |
Total HTM |  | $ | 368,058 |  |  | $ | 5,977 |  |  | $ | (737 | ) |  | $ | 373,298 |  |  | $ | 462,096 |  |  | $ | 5,137 |  |  | $ | (1,273 | ) |  | $ | 465,960 |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | -- |  |  | $ | -- |  |  | $ | -- |  |  | $ | -- |  |  | $ | 300 |  |  | $ | -- |  |  | $ | -- |  |  | $ | 300 |
U.S. Government agencies |  |  | 141,559 |  |  |  | 116 |  |  |  | (1,951 | ) |  |  | 139,724 |  |  |  | 140,005 |  |  |  | 67 |  |  |  | (2,301 | ) |  |  | 137,771 |
Mortgage-backed securities |  |  | 1,208,017 |  |  |  | 246 |  |  |  | (20,946 | ) |  |  | 1,187,317 |  |  |  | 885,783 |  |  |  | 178 |  |  |  | (17,637 | ) |  |  | 868,324 |
State and political subdivisions |  |  | 144,642 |  |  |  | 532 |  |  |  | (2,009 | ) |  |  | 143,165 |  |  |  | 108,374 |  |  |  | 38 |  |  |  | (5,469 | ) |  |  | 102,943 |
Other securities |  |  | 118,106 |  |  |  | 1,206 |  |  |  | (1 | ) |  |  | 119,311 |  |  |  | 47,022 |  |  |  | 996 |  |  |  | (2 | ) |  |  | 48,016 |
Total AFS |  | $ | 1,612,324 |  |  | $ | 2,100 |  |  | $ | (24,907 | ) |  | $ | 1,589,517 |  |  | $ | 1,181,484 |  |  | $ | 1,279 |  |  | $ | (25,409 | ) |  | $ | 1,157,354 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Less Than 12 Months |  | 12 Months or More |  | Total
(In thousands) |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 11,961 |  |  | $ | 6 |  |  | $ | 32,778 |  |  | $ | 222 |  |  | $ | 44,739 |  |  | $ | 228 |
Mortgage-backed securities |  |  | 5,471 |  |  |  | 47 |  |  |  | 8,946 |  |  |  | 240 |  |  |  | 14,417 |  |  |  | 287 |
State and political subdivisions |  |  | 40,299 |  |  |  | 198 |  |  |  | 1,887 |  |  |  | 24 |  |  |  | 42,186 |  |  |  | 222 |
Total HTM |  | $ | 57,731 |  |  | $ | 251 |  |  | $ | 43,611 |  |  | $ | 486 |  |  | $ | 101,342 |  |  | $ | 737 |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 91,988 |  |  | $ | 921 |  |  | $ | 25,742 |  |  | $ | 1,030 |  |  | $ | 117,730 |  |  | $ | 1,951 |
Mortgage-backed securities |  |  | 510,770 |  |  |  | 4,516 |  |  |  | 609,329 |  |  |  | 16,430 |  |  |  | 1,120,099 |  |  |  | 20,946 |
State and political subdivisions |  |  | 25,049 |  |  |  | 202 |  |  |  | 75,404 |  |  |  | 1,807 |  |  |  | 100,453 |  |  |  | 2,009 |
Other securities |  |  | -- |  |  |  | -- |  |  |  | 99 |  |  |  | 1 |  |  |  | 99 |  |  |  | 1 |
Total AFS |  | $ | 627,807 |  |  | $ | 5,639 |  |  | $ | 710,574 |  |  | $ | 19,268 |  |  | $ | 1,338,381 |  |  | $ | 24,907 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 32,859 |  |  | $ | 141 |  |  | $ | 19,959 |  |  | $ | 41 |  |  | $ | 52,818 |  |  | $ | 182 |
Mortgage-backed securities |  |  | 11,833 |  |  |  | 205 |  |  |  | 1,465 |  |  |  | 44 |  |  |  | 13,298 |  |  |  | 249 |
State and political subdivisions |  |  | 104,974 |  |  |  | 841 |  |  |  | 330 |  |  |  | 1 |  |  |  | 105,304 |  |  |  | 842 |
Total HTM |  | $ | 149,666 |  |  | $ | 1,187 |  |  | $ | 21,754 |  |  | $ | 86 |  |  | $ | 171,420 |  |  | $ | 1,273 |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 126,325 |  |  | $ | 2,301 |  |  | $ | -- |  |  | $ | -- |  |  | $ | 126,325 |  |  | $ | 2,301 |
Mortgage-backed securities |  |  | 833,393 |  |  |  | 17,637 |  |  |  | -- |  |  |  | -- |  |  |  | 833,393 |  |  |  | 17,637 |
State and political subdivisions |  |  | 94,922 |  |  |  | 5,469 |  |  |  | -- |  |  |  | -- |  |  |  | 94,922 |  |  |  | 5,469 |
Other securities |  |  | 99 |  |  |  | 2 |  |  |  | -- |  |  |  | -- |  |  |  | 99 |  |  |  | 2 |
Total AFS |  | $ | 1,054,739 |  |  | $ | 25,409 |  |  | $ | -- |  |  | $ | -- |  |  | $ | 1,054,739 |  |  | $ | 25,409 |
Investment Income [Table Text Block] |
(In thousands) |  | 2017 |  | 2016 |  | 2015
Taxable |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity |  | $ | 2,521 |  |  | $ | 3,778 |  |  | $ | 5,162 |
Available-for-sale |  |  | 25,996 |  |  |  | 17,928 |  |  |  | 12,129 |
Non-taxable |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity |  |  | 8,693 |  |  |  | 10,641 |  |  |  | 11,635 |
Available-for-sale |  |  | 2,905 |  |  |  | 1,132 |  |  |  | 1,687 |
Total |  | $ | 40,115 |  |  | $ | 33,479 |  |  | $ | 30,613 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Held-to-Maturity |  | Available-for-Sale
(In thousands) |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
One year or less |  | $ | 46,377 |  |  | $ | 46,255 |  |  | $ | 590 |  |  | $ | 591 |
After one through five years |  |  | 85,451 |  |  |  | 85,581 |  |  |  | 35,616 |  |  |  | 35,246 |
After five through ten years |  |  | 92,361 |  |  |  | 93,400 |  |  |  | 24,203 |  |  |  | 23,953 |
After ten years |  |  | 127,737 |  |  |  | 132,209 |  |  |  | 225,892 |  |  |  | 223,198 |
Securities not due on a single maturity date |  |  | 16,132 |  |  |  | 15,853 |  |  |  | 1,208,017 |  |  |  | 1,187,317 |
Other securities (no maturity) |  |  | -- |  |  |  | -- |  |  |  | 118,006 |  |  |  | 119,212 |
Total |  | $ | 368,058 |  |  | $ | 373,298 |  |  | $ | 1,612,324 |  |  | $ | 1,589,517 |

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