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INVESTMENT SECURITIES | 9 Months Ended
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Sep. 30, 2020
INVESTMENT SECURITIES |
INVESTMENT SECURITIES | NOTE D: INVESTMENT SECURITIES The amortized cost and estimated fair value of investment securities as of September 30, 2020 and December 31, 2019 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020 | ​ | December 31, 2019
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(000's omitted) |  | Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value
Available-for-Sale Portfolio: | ​ | ​ | ​ |  | ​ |  |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agency securities | ​ | $ | 2,034,512 | ​ | $ | 114,658 | ​ | $ | 0 | ​ | $ | 2,149,170 | ​ | $ | 2,030,060 | ​ | $ | 21,674 | ​ | $ | 7,975 | ​ | $ | 2,043,759
Obligations of state and political subdivisions | ​ |  | 470,518 | ​ |  | 22,978 | ​ |  | 0 | ​ |  | 493,496 | ​ |  | 497,852 | ​ |  | 14,382 | ​ |  | 26 | ​ |  | 512,208
Government agency mortgage-backed securities | ​ |  | 508,738 | ​ |  | 15,514 | ​ |  | 278 | ​ |  | 523,974 | ​ |  | 428,491 | ​ |  | 5,478 | ​ |  | 1,107 | ​ |  | 432,862
Corporate debt securities | ​ |  | 4,504 | ​ |  | 98 | ​ |  | 0 | ​ |  | 4,602 | ​ |  | 2,527 | ​ |  | 1 | ​ |  | 0 | ​ |  | 2,528
Government agency collateralized mortgage obligations | ​ |  | 50,134 | ​ |  | 1,354 | ​ |  | 8 | ​ |  | 51,480 | ​ |  | 52,621 | ​ |  | 482 | ​ |  | 32 | ​ |  | 53,071
Total available-for-sale portfolio | ​ | $ | 3,068,406 | ​ | $ | 154,602 | ​ | $ | 286 | ​ | $ | 3,222,722 | ​ | $ | 3,011,551 | ​ | $ | 42,017 | ​ | $ | 9,140 | ​ | $ | 3,044,428
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity and other Securities: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Equity securities, at fair value | ​ | $ | 251 | ​ | $ | 192 | ​ | $ | 20 | ​ | $ | 423 | ​ | $ | 251 | ​ | $ | 200 | ​ | $ | 0 | ​ | $ | 451
Federal Home Loan Bank common stock | ​ |  | 7,545 | ​ |  | 0 | ​ |  | 0 | ​ |  | 7,545 | ​ |  | 7,246 | ​ |  | 0 | ​ |  | 0 | ​ |  | 7,246
Federal Reserve Bank common stock | ​ |  | 33,916 | ​ |  | 0 | ​ |  | 0 | ​ |  | 33,916 | ​ |  | 30,922 | ​ |  | 0 | ​ |  | 0 | ​ |  | 30,922
Other equity securities, at adjusted cost | ​ |  | 4,707 | ​ |  | 750 | ​ |  | 0 | ​ |  | 5,457 | ​ |  | 4,546 | ​ |  | 750 | ​ |  | 0 | ​ |  | 5,296
Total equity and other securities | ​ | $ | 46,419 | ​ | $ | 942 | ​ | $ | 20 | ​ | $ | 47,341 | ​ | $ | 42,965 | ​ | $ | 950 | ​ | $ | 0 | ​ | $ | 43,915
​ A summary of investment securities that have been in a continuous unrealized loss position is as follows: As of September 30, 2020 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 Months | ​ | 12 Months or Longer | ​ | Total
​ |  |  |  | ​ | ​ |  | Gross |  |  |  | ​ | ​ |  | Gross |  |  |  | ​ | ​ |  | Gross
​ | ​ | ​ |  | Fair |  | Unrealized | ​ | ​ |  | Fair |  | Unrealized | ​ | ​ |  | Fair |  | Unrealized
(000's omitted) |  | # |  | Value |  | Losses |  | # |  | Value |  | Losses |  | # |  | Value |  | Losses
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-Sale Portfolio: |  |  |  | ​ |  |  | ​ |  |  |  |  | ​ |  |  | ​ |  |  |  |  | ​ |  |  | ​ |
U.S. Treasury and agency securities |  | 1 | ​ | $ | 1,010 | ​ | $ | 0 |  | 0 | ​ | $ | 0 | ​ | $ | 0 |  | 1 | ​ | $ | 1,010 | ​ | $ | 0
Obligations of state and political subdivisions |  | 1 | ​ |  | 196 | ​ |  | 0 |  | 0 | ​ |  | 0 | ​ |  | 0 |  | 1 | ​ |  | 196 | ​ |  | 0
Government agency mortgage-backed securities |  | 91 | ​ |  | 62,318 | ​ |  | 278 |  | 2 | ​ |  | 14 | ​ |  | 0 |  | 93 | ​ |  | 62,332 | ​ |  | 278
Government agency collateralized mortgage obligations |  | 14 | ​ |  | 4,244 | ​ |  | 8 |  | 1 | ​ |  | 0 | ​ |  | 0 |  | 15 | ​ |  | 4,244 | ​ |  | 8
Total available-for-sale investment portfolio |  | 107 | ​ | $ | 67,768 | ​ | $ | 286 |  | 3 | ​ | $ | 14 | ​ | $ | 0 |  | 110 | ​ | $ | 67,782 | ​ | $ | 286
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity and other Securities: |  |  | ​ |  |  | ​ |  |  |  |  | ​ |  |  | ​ |  |  |  |  | ​ |  |  | ​ |  |
Equity securities, at fair value |  | 1 | ​ | $ | 81 | ​ | $ | 20 |  | 0 | ​ | $ | 0 | ​ | $ | 0 |  | 1 | ​ | $ | 81 | ​ | $ | 20
Total equity and other securities |  | 1 | ​ | $ | 81 | ​ | $ | 20 |  | 0 | ​ | $ | 0 | ​ | $ | 0 |  | 1 | ​ | $ | 81 | ​ | $ | 20
​ As of December 31, 2019 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 Months | ​ | 12 Months or Longer | ​ | Total
​ |  |  |  | ​ | ​ |  | Gross |  |  |  | ​ | ​ |  | Gross |  |  |  | ​ | ​ |  | Gross
​ | ​ | ​ |  | Fair |  | Unrealized | ​ | ​ |  | Fair |  | Unrealized | ​ | ​ |  | Fair |  | Unrealized
(000's omitted) |  | # |  | Value |  | Losses |  | # |  | Value |  | Losses |  | # |  | Value |  | Losses
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-Sale Portfolio: |  |  |  | ​ |  |  | ​ |  |  |  |  | ​ |  |  | ​ |  |  |  |  | ​ |  |  | ​ |
U.S. Treasury and agency securities |  | 12 | ​ | $ | 592,678 | ​ | $ | 7,970 |  | 5 | ​ | $ | 25,998 | ​ | $ | 5 |  | 17 | ​ | $ | 618,676 | ​ | $ | 7,975
Obligations of state and political subdivisions |  | 21 | ​ |  | 22,716 | ​ |  | 26 |  | 0 | ​ |  | 0 | ​ |  | 0 |  | 21 | ​ |  | 22,716 | ​ |  | 26
Government agency mortgage-backed securities |  | 50 | ​ |  | 89,237 | ​ |  | 341 |  | 52 | ​ |  | 52,975 | ​ |  | 766 |  | 102 | ​ |  | 142,212 | ​ |  | 1,107
Government agency collateralized mortgage obligations |  | 5 | ​ |  | 5,971 | ​ |  | 14 |  | 5 | ​ |  | 4,405 | ​ |  | 18 |  | 10 | ​ |  | 10,376 | ​ |  | 32
Total available-for-sale investment portfolio |  | 88 | ​ | $ | 710,602 | ​ | $ | 8,351 |  | 62 | ​ | $ | 83,378 | ​ | $ | 789 |  | 150 | ​ | $ | 793,980 | ​ | $ | 9,140
​ The unrealized losses reported pertaining to securities issued by the U.S. government and its sponsored entities, include treasuries, agencies, and mortgage-backed securities issued by Ginnie Mae, Fannie Mae, and Freddie Mac, which are currently rated AAA by Moody’s Investor Services, AA+ by Standard & Poor’s and are guaranteed by the U.S. government. The majority of the obligations of state and political subdivisions and corporations carry a credit rating of A or better. Additionally, a majority of the obligations of state and political subdivisions carry a secondary level of credit enhancement. The Company does not intend to sell these securities, nor is it more likely than not that the Company will be required to sell these securities prior to recovery of the amortized cost. Timely principal and interest payments continue to be made on the securities. The unrealized losses in the portfolios are primarily attributable to changes in interest rates. As such, management does not believe any individual unrealized loss as of September 30, 2020 represents credit losses and no unrealized losses have been recognized in the provision for credit losses. Accordingly, there is no allowance for credit losses on the Company’s available-for-sale portfolio as of September 30, 2020. As of December 31, 2019, management did not believe any individual unrealized loss represents other-than-temporary impairment. The amortized cost and estimated fair value of debt securities at September 30, 2020, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available-for-Sale
​ |  | Amortized |  | Fair
(000's omitted) |  | Cost |  | Value
Due in one year or less | ​ | $ | 760,019 | ​ | $ | 765,009
Due after one through five years | ​ |  | 802,750 | ​ |  | 843,487
Due after five years through ten years | ​ |  | 461,012 | ​ |  | 503,778
Due after ten years | ​ |  | 485,753 | ​ |  | 534,994
Subtotal | ​ |  | 2,509,534 | ​ |  | 2,647,268
Government agency mortgage-backed securities | ​ |  | 508,738 | ​ |  | 523,974
Government agency collateralized mortgage obligations | ​ |  | 50,134 | ​ |  | 51,480
Total | ​ | $ | 3,068,406 | ​ | $ | 3,222,722
​ As of September 30, 2020, $295.5 million of U.S. Treasury securities were pledged as collateral for securities sold under agreement to repurchase. All securities sold under agreement to repurchase as of September 30, 2020 have an overnight and continuous maturity. During the nine months ended September 30, 2019, the Company sold $590.2 million of U.S. Treasury and agency securities, recognizing $5.0 million of gross realized gains and $0.1 million of gross realized losses.

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