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INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2022
INVESTMENT SECURITIES. |
Schedule of amortized cost and estimated fair value of investment securities | The amortized cost and estimated fair value of investment securities as of June 30, 2022 and December 31, 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022 | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | 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 | ​ | $ | 5,199,745 | ​ | $ | 165 | ​ | $ | 584,364 | ​ | $ | 4,615,546 | ​ | $ | 4,064,624 | ​ | $ | 39,997 | ​ | $ | 106,057 | ​ | $ | 3,998,564
Obligations of state and political subdivisions | ​ |  | 565,701 | ​ |  | 2,224 | ​ |  | 40,770 | ​ |  | 527,155 | ​ |  | 413,019 | ​ |  | 17,326 | ​ |  | 56 | ​ |  | 430,289
Government agency mortgage-backed securities | ​ |  | 466,276 | ​ |  | 397 | ​ |  | 41,316 | ​ |  | 425,357 | ​ |  | 474,506 | ​ |  | 7,615 | ​ |  | 5,065 | ​ |  | 477,056
Corporate debt securities | ​ |  | 8,000 | ​ |  | 0 | ​ |  | 769 | ​ |  | 7,231 | ​ |  | 8,000 | ​ |  | 39 | ​ |  | 77 | ​ |  | 7,962
Government agency collateralized mortgage obligations | ​ |  | 15,537 | ​ |  | 7 | ​ |  | 406 | ​ |  | 15,138 | ​ |  | 19,953 | ​ |  | 410 | ​ |  | 24 | ​ |  | 20,339
Total available-for-sale investment portfolio | ​ | $ | 6,255,259 | ​ | $ | 2,793 | ​ | $ | 667,625 | ​ | $ | 5,590,427 | ​ | $ | 4,980,102 | ​ | $ | 65,387 | ​ | $ | 111,279 | ​ | $ | 4,934,210
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity and other Securities: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Equity securities, at fair value | ​ | $ | 251 | ​ | $ | 192 | ​ | $ | 0 | ​ | $ | 443 | ​ | $ | 251 | ​ | $ | 212 | ​ | $ | 0 | ​ | $ | 463
Federal Home Loan Bank common stock | ​ |  | 13,199 | ​ |  | 0 | ​ |  | 0 | ​ |  | 13,199 | ​ |  | 7,188 | ​ |  | 0 | ​ |  | 0 | ​ |  | 7,188
Federal Reserve Bank common stock | ​ |  | 35,323 | ​ |  | 0 | ​ |  | 0 | ​ |  | 35,323 | ​ |  | 33,916 | ​ |  | 0 | ​ |  | 0 | ​ |  | 33,916
Other equity securities, at adjusted cost | ​ |  | 2,880 | ​ |  | 750 | ​ |  | 0 | ​ |  | 3,630 | ​ |  | 2,562 | ​ |  | 750 | ​ |  | 0 | ​ |  | 3,312
Total equity and other securities | ​ | $ | 51,653 | ​ | $ | 942 | ​ | $ | 0 | ​ | $ | 52,595 | ​ | $ | 43,917 | ​ | $ | 962 | ​ | $ | 0 | ​ | $ | 44,879
Schedule of investment securities that have been in a continuous unrealized loss position for less than or greater than twelve months | A summary of investment securities that have been in a continuous unrealized loss position is as follows: As of June 30, 2022 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​ | 109 | ​ | $ | 3,693,538 | ​ | $ | 291,840 | ​ | 18 | ​ | $ | 797,349 | ​ | $ | 292,524 | ​ | 127 | ​ | $ | 4,490,887 | ​ | $ | 584,364
Obligations of state and political subdivisions | ​ | 514 | ​ |  | 348,257 | ​ |  | 40,770 | ​ | 0 | ​ |  | 0 | ​ |  | 0 | ​ | 514 | ​ |  | 348,257 | ​ |  | 40,770
Government agency mortgage-backed securities | ​ | 578 | ​ |  | 304,192 | ​ |  | 22,788 | ​ | 90 | ​ |  | 105,017 | ​ |  | 18,528 | ​ | 668 | ​ |  | 409,209 | ​ |  | 41,316
Corporate debt securities | ​ | 2 | ​ | ​ | 7,231 | ​ | ​ | 769 | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0 | ​ | 2 | ​ | ​ | 7,231 | ​ | ​ | 769
Government agency collateralized mortgage obligations | ​ | 39 | ​ |  | 14,298 | ​ |  | 406 | ​ | 1 | ​ |  | 10 | ​ |  | 0 | ​ | 40 | ​ |  | 14,308 | ​ |  | 406
Total available-for-sale investment portfolio | ​ | 1,242 | ​ | $ | 4,367,516 | ​ | $ | 356,573 | ​ | 109 | ​ | $ | 902,376 | ​ | $ | 311,052 | ​ | 1,351 | ​ | $ | 5,269,892 | ​ | $ | 667,625
​ As of December 31, 2021 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​ | 47 | ​ | $ | 1,224,101 | ​ | $ | 14,873 | ​ | 13 | ​ | $ | 900,462 | ​ | $ | 91,184 | ​ | 60 | ​ | $ | 2,124,563 | ​ | $ | 106,057
Obligations of state and political subdivisions | ​ | 27 | ​ |  | 23,966 | ​ |  | 56 | ​ | 0 | ​ |  | 0 | ​ |  | 0 | ​ | 27 | ​ |  | 23,966 | ​ |  | 56
Government agency mortgage-backed securities | ​ | 147 | ​ |  | 139,442 | ​ |  | 2,475 | ​ | 52 | ​ |  | 67,273 | ​ |  | 2,590 | ​ | 199 | ​ |  | 206,715 | ​ |  | 5,065
Corporate debt securities | ​ | 1 | ​ | ​ | 4,923 | ​ | ​ | 77 | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0 | ​ | 1 | ​ | ​ | 4,923 | ​ | ​ | 77
Government agency collateralized mortgage obligations | ​ | 18 | ​ |  | 3,146 | ​ |  | 24 | ​ | 1 | ​ |  | 53 | ​ |  | 0 | ​ | 19 | ​ |  | 3,199 | ​ |  | 24
Total available-for-sale investment portfolio | ​ | 240 | ​ | $ | 1,395,578 | ​ | $ | 17,505 | ​ | 66 | ​ | $ | 967,788 | ​ | $ | 93,774 | ​ | 306 | ​ | $ | 2,363,366 | ​ | $ | 111,279
​
Schedule of amortized cost and estimated fair value of debt securities by contractual maturity | The amortized cost and estimated fair value of debt securities at June 30, 2022, 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, including government agency mortgage-backed securities and government agency collateralized mortgage obligations, are shown separately. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Available-for-Sale
​ | ​ | Amortized | ​ | ​
(000’s omitted) |  | Cost |  | Fair Value
Due in one year or less | ​ | $ | 496,539 | ​ | $ | 495,239
Due after one through five years | ​ |  | 1,497,928 | ​ |  | 1,424,444
Due after five years through ten years | ​ |  | 2,119,643 | ​ |  | 1,922,167
Due after ten years | ​ |  | 1,659,336 | ​ |  | 1,308,082
Subtotal | ​ |  | 5,773,446 | ​ |  | 5,149,932
Government agency mortgage-backed securities | ​ |  | 466,276 | ​ |  | 425,357
Government agency collateralized mortgage obligations | ​ |  | 15,537 | ​ |  | 15,138
Total | ​ | $ | 6,255,259 | ​ | $ | 5,590,427

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