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Note 3 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2017
Notes Tables |
Investment [Table Text Block] |
|  | September 30, 2017 |  | December 31, 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 |  | $ | 66,928 |  |  | $ | 40 |  |  | $ | (140 | ) |  | $ | 66,828 |  |  | $ | 76,875 |  |  | $ | 107 |  |  | $ | (182 | ) |  | $ | 76,800 |
Mortgage-backed securities |  |  | 16,972 |  |  |  | 56 |  |  |  | (191 | ) |  |  | 16,837 |  |  |  | 19,773 |  |  |  | 63 |  |  |  | (249 | ) |  |  | 19,587 |
State and political subdivisions |  |  | 320,116 |  |  |  | 6,397 |  |  |  | (55 | ) |  |  | 326,458 |  |  |  | 362,532 |  |  |  | 4,967 |  |  |  | (842 | ) |  |  | 366,657 |
Other securities |  |  | 2,017 |  |  |  | -- |  |  |  | -- |  |  |  | 2,017 |  |  |  | 2,916 |  |  |  | -- |  |  |  | -- |  |  |  | 2,916 |
Total HTM |  | $ | 406,033 |  |  | $ | 6,493 |  |  | $ | (386 | ) |  | $ | 412,140 |  |  | $ | 462,096 |  |  | $ | 5,137 |  |  | $ | (1,273 | ) |  | $ | 465,960 |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | -- |  |  | $ | -- |  |  | $ | -- |  |  | $ | -- |  |  | $ | 300 |  |  | $ | -- |  |  | $ | -- |  |  | $ | 300 |
U.S. Government agencies |  |  | 210,004 |  |  |  | 273 |  |  |  | (2,057 | ) |  |  | 208,220 |  |  |  | 140,005 |  |  |  | 67 |  |  |  | (2,301 | ) |  |  | 137,771 |
Mortgage-backed securities |  |  | 973,111 |  |  |  | 120 |  |  |  | (13,533 | ) |  |  | 959,698 |  |  |  | 885,783 |  |  |  | 178 |  |  |  | (17,637 | ) |  |  | 868,324 |
State and political subdivisions |  |  | 87,405 |  |  |  | 161 |  |  |  | (2,744 | ) |  |  | 84,822 |  |  |  | 108,374 |  |  |  | 38 |  |  |  | (5,469 | ) |  |  | 102,943 |
Other securities |  |  | 63,295 |  |  |  | 1,385 |  |  |  | -- |  |  |  | 64,680 |  |  |  | 47,022 |  |  |  | 996 |  |  |  | (2 | ) |  |  | 48,016 |
Total AFS |  | $ | 1,333,815 |  |  | $ | 1,939 |  |  | $ | (18,334 | ) |  | $ | 1,317,420 |  |  | $ | 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
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 12,947 |  |  | $ | (53 | ) |  | $ | 39,913 |  |  | $ | (87 | ) |  | $ | 52,860 |  |  | $ | (140 | )
Mortgage-backed securities |  |  | 4,094 |  |  |  | (42 | ) |  |  | 6,687 |  |  |  | (149 | ) |  |  | 10,781 |  |  |  | (191 | )
State and political subdivisions |  |  | 11,300 |  |  |  | (41 | ) |  |  | 2,634 |  |  |  | (14 | ) |  |  | 13,934 |  |  |  | (55 | )
Total HTM |  | $ | 28,341 |  |  | $ | (136 | ) |  | $ | 49,234 |  |  | $ | (250 | ) |  | $ | 77,575 |  |  | $ | (386 | )
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 66,254 |  |  | $ | (750 | ) |  | $ | 82,211 |  |  | $ | (1,307 | ) |  | $ | 148,465 |  |  | $ | (2,057 | )
Mortgage-backed securities |  |  | 626,560 |  |  |  | (7,458 | ) |  |  | 273,883 |  |  |  | (6,075 | ) |  |  | 900,443 |  |  |  | (13,533 | )
State and political subdivisions |  |  | 1,813 |  |  |  | (32 | ) |  |  | 76,781 |  |  |  | (2,712 | ) |  |  | 78,594 |  |  |  | (2,744 | )
Other securities |  |  | -- |  |  |  | -- |  |  |  | 100 |  |  |  | -- |  |  |  | 100 |  |  |  | -- |
Total AFS |  | $ | 694,627 |  |  | $ | (8,240 | ) |  | $ | 432,975 |  |  | $ | (10,094 | ) |  | $ | 1,127,602 |  |  | $ | (18,334 | )
Investment Income [Table Text Block] |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Taxable: |  |  |  |  |  |  |  |
Held-to-maturity |  | $ | 625 |  |  | $ | 771 |  |  | $ | 1,922 |  |  | $ | 3,094 |
Available-for-sale |  |  | 5,949 |  |  |  | 4,005 |  |  |  | 18,003 |  |  |  | 12,931 |
Non-taxable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity |  |  | 2,135 |  |  |  | 2,617 |  |  |  | 6,635 |  |  |  | 8,162 |
Available-for-sale |  |  | 509 |  |  |  | 381 |  |  |  | 2,099 |  |  |  | 592 |
Total |  | $ | 9,218 |  |  | $ | 7,774 |  |  | $ | 28,659 |  |  | $ | 24,779 |
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 |  | $ | 50,829 |  |  | $ | 50,838 |  |  | $ | 21,211 |  |  | $ | 21,145 |
After one through five years |  |  | 105,323 |  |  |  | 105,823 |  |  |  | 81,147 |  |  |  | 80,388 |
After five through ten years |  |  | 99,399 |  |  |  | 100,902 |  |  |  | 14,532 |  |  |  | 14,427 |
After ten years |  |  | 133,510 |  |  |  | 137,740 |  |  |  | 181,619 |  |  |  | 178,182 |
Securities not due on a single maturity date |  |  | 16,972 |  |  |  | 16,837 |  |  |  | 973,111 |  |  |  | 959,698 |
Other securities (no maturity) |  |  | -- |  |  |  | -- |  |  |  | 62,195 |  |  |  | 63,580 |
Total |  | $ | 406,033 |  |  | $ | 412,140 |  |  | $ | 1,333,815 |  |  | $ | 1,317,420 |

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