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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Investment [Table Text Block] |
|  | Years Ended December 31
|  | 2016 |  | 2015
(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 |  | $ | 76,875 |  |  | $ | 107 |  |  | $ | (182 | ) |  | $ | 76,800 |  |  | $ | 237,139 |  |  | $ | 582 |  |  | $ | (1,395 | ) |  | $ | 236,326 |
Mortgage-backed securities |  |  | 19,773 |  |  |  | 63 |  |  |  | (249 | ) |  |  | 19,587 |  |  |  | 24,774 |  |  |  | 86 |  |  |  | (290 | ) |  |  | 24,570 |
State and political subdivisions |  |  | 362,532 |  |  |  | 4,967 |  |  |  | (842 | ) |  |  | 366,657 |  |  |  | 440,676 |  |  |  | 9,138 |  |  |  | (123 | ) |  |  | 449,691 |
Other securities |  |  | 2,916 |  |  |  | -- |  |  |  | -- |  |  |  | 2,916 |  |  |  | 2,784 |  |  |  | -- |  |  |  | -- |  |  |  | 2,784 |
Total |  | $ | 462,096 |  |  | $ | 5,137 |  |  | $ | (1,273 | ) |  | $ | 465,960 |  |  | $ | 705,373 |  |  | $ | 9,806 |  |  | $ | (1,808 | ) |  | $ | 713,371 |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 300 |  |  | $ | -- |  |  | $ | -- |  |  | $ | 300 |  |  | $ | 4,000 |  |  | $ | -- |  |  | $ | (6 | ) |  | $ | 3,994 |
U.S. Government agencies |  |  | 140,005 |  |  |  | 67 |  |  |  | (2,301 | ) |  |  | 137,771 |  |  |  | 121,017 |  |  |  | 118 |  |  |  | (898 | ) |  |  | 120,237 |
Mortgage-backed securities |  |  | 885,783 |  |  |  | 178 |  |  |  | (17,637 | ) |  |  | 868,324 |  |  |  | 650,619 |  |  |  | 937 |  |  |  | (4,130 | ) |  |  | 647,426 |
State and political subdivisions |  |  | 108,374 |  |  |  | 38 |  |  |  | (5,469 | ) |  |  | 102,943 |  |  |  | 9,762 |  |  |  | 112 |  |  |  | -- |  |  |  | 9,874 |
Other securities |  |  | 47,022 |  |  |  | 996 |  |  |  | (2 | ) |  |  | 48,016 |  |  |  | 39,594 |  |  |  | 420 |  |  |  | (138 | ) |  |  | 39,876 |
Total |  | $ | 1,181,484 |  |  | $ | 1,279 |  |  | $ | (25,409 | ) |  | $ | 1,157,354 |  |  | $ | 824,992 |  |  | $ | 1,587 |  |  | $ | (5,172 | ) |  | $ | 821,407 |
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, 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 |  | $ | 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 |  | $ | 1,054,739 |  |  | $ | 25,409 |  |  | $ | -- |  |  | $ | -- |  |  | $ | 1,054,739 |  |  | $ | 25,409 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 107,758 |  |  | $ | 567 |  |  | $ | 79,166 |  |  | $ | 828 |  |  | $ | 186,924 |  |  | $ | 1,395 |
Mortgage-backed securities |  |  | 7,958 |  |  |  | 94 |  |  |  | 8,144 |  |  |  | 196 |  |  |  | 16,102 |  |  |  | 290 |
State and political subdivisions |  |  | 27,866 |  |  |  | 100 |  |  |  | 3,946 |  |  |  | 23 |  |  |  | 31,812 |  |  |  | 123 |
Total |  | $ | 143,582 |  |  | $ | 761 |  |  | $ | 91,256 |  |  | $ | 1,047 |  |  | $ | 234,838 |  |  | $ | 1,808 |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 3,994 |  |  | $ | 6 |  |  | $ | -- |  |  | $ | -- |  |  | $ | 3,994 |  |  | $ | 6 |
U.S. Government agencies |  |  | 62,473 |  |  |  | 317 |  |  |  | 46,023 |  |  |  | 581 |  |  |  | 108,496 |  |  |  | 898 |
Mortgage-backed securities |  |  | 523,185 |  |  |  | 4,130 |  |  |  | -- |  |  |  | -- |  |  |  | 523,185 |  |  |  | 4,130 |
State and political subdivisions |  |  | 281 |  |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | 281 |  |  |  | -- |
Other securities |  |  | 1,060 |  |  |  | 137 |  |  |  | 510 |  |  |  | 1 |  |  |  | 1,570 |  |  |  | 138 |
Total |  | $ | 590,993 |  |  | $ | 4,590 |  |  | $ | 46,533 |  |  | $ | 582 |  |  | $ | 637,526 |  |  | $ | 5,172 |
Investment Income [Table Text Block] |
(In thousands) |  | 2016 |  | 2015 |  | 2014
Taxable |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity |  | $ | 3,778 |  |  | $ | 5,162 |  |  | $ | 5,839 |
Available-for-sale |  |  | 17,928 |  |  |  | 12,129 |  |  |  | 2,785 |
Non-taxable |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity |  |  | 10,641 |  |  |  | 11,635 |  |  |  | 10,625 |
Available-for-sale |  |  | 1,132 |  |  |  | 1,687 |  |  |  | 108 |
Total |  | $ | 33,479 |  |  | $ | 30,613 |  |  | $ | 19,357 |
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 |  | $ | 52,055 |  |  | $ | 52,034 |  |  | $ | 1,552 |  |  | $ | 1,552 |
After one through five years |  |  | 122,870 |  |  |  | 123,029 |  |  |  | 96,774 |  |  |  | 95,688 |
After five through ten years |  |  | 105,482 |  |  |  | 106,097 |  |  |  | 12,756 |  |  |  | 12,539 |
After ten years |  |  | 161,916 |  |  |  | 165,213 |  |  |  | 138,697 |  |  |  | 132,335 |
Securities not due on a single maturity date |  |  | 19,773 |  |  |  | 19,587 |  |  |  | 885,783 |  |  |  | 868,324 |
Other securities (no maturity) |  |  | -- |  |  |  | -- |  |  |  | 45,922 |  |  |  | 46,916 |
Total |  | $ | 462,096 |  |  | $ | 465,960 |  |  | $ | 1,181,484 |  |  | $ | 1,157,354 |

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