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Note 3 - Investment Securities | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | NOTE 3: INVESTMENT SECURITIES The amortized cost and fair value of investment securities that are classified as held-to-maturity and available-for-sale are as follows:
|  | 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 |
Securities with limited marketability, such as stock in the Federal Reserve Bank and the Federal Home Loan Bank, are carried at cost and are reported as other available-for-sale securities in the table above. Certain investment securities are valued at less than their historical cost. Total fair value of these investments at December 31, 2016 and 2015, was $1.2 billion and $872.4 million, which is approximately 75.7% and 57.1%, respectively, of the Company’s combined available-for-sale and held-to-maturity investment portfolios.
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The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31:
|  | 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 |
These declines primarily resulted from the rate for these investments yielding less than current market rates. Based on evaluation of available evidence, management believes the declines in fair value for these securities are temporary. Management does not have the intent to sell these securities and management believes it is more likely than not the Company will not have to sell these securities before recovery of their amortized cost basis less any current period credit losses. Declines in the fair value of held-to-maturity and available-for-sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. Management has the ability and intent to hold the securities classified as held to maturity until they mature, at which time the Company expects to receive full value for the securities. Furthermore, as of December 31, 2016, management also had the ability and intent to hold the securities classified as available-for-sale for a period of time sufficient for a recovery of cost. The unrealized losses are largely due to increases in market interest rates over the yields available at the time the underlying securities were purchased. The fair value is expected to recover as the bonds approach their maturity date or repricing date or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons of credit quality. Accordingly, as of December 31, 2016, management believes the impairments detailed in the table above are temporary. Should the impairment of any of these securities become other than temporary, the cost basis of the investment will be reduced and the resulting loss recognized in net income in the period the other-than-temporary impairment is identified.
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Income earned on the above securities for the years ended December 31, 2016, 2015 and 2014, is as follows:
(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 |
The amortized cost and estimated fair value by maturity of securities are shown in the following table. Securities are classified according to their contractual maturities without consideration of principal amortization, potential prepayments or call options. Accordingly, actual maturities may differ from contractual maturities.
|  | 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 |
The carrying value, which approximates the fair value, of securities pledged as collateral, to secure public deposits and for other purposes, amounted to $915.2 million at December 31, 2016 and $840.4 million at December 31, 2015. The book value of securities sold under agreements to repurchase amounted to $102.4 million and $96.8 million for December 31, 2016 and 2015, respectively. There were $5.8 million of gross realized gains and no realized losses from the sale of available for sale securities during the year ended December 31, 2016. There were $350,000 of gross realized gains and $43,000 of realized losses from the sale of available for sale securities during the year ended December 31, 2015. There were $199,000 of gross realized gains and $191,000 of realized losses from the sale of available for sale securities during the year ended December 31, 2014. The income tax expense/benefit related to security gains/losses was 39.225% of the gross amounts. The state and political subdivision debt obligations are primarily non-rated bonds and representing small issuances, primarily in Arkansas, Missouri, Tennessee and Texas, which are evaluated on an ongoing basis.

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