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v3.22.1

Securities (Tables) | 3 Months Ended
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Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Debt Securities, Held-to-maturity [Table Text Block] | A summary of the amortized cost, fair value and allowance for credit losses related to securities held to maturity as of March 31, 2022 and December 31, 2021 is presented below.
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Allowance for Credit Losses |  | Net Carrying Amount
March 31, 2022 |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 526,969 |  |  | $ | — |  |  | $ | 17,519 |  |  | $ | 509,450 |  |  | $ | — |  |  | $ | 526,969 |
States and political subdivisions | 1,137,154 |  |  | 3,622 |  |  | 11,717 |  |  | 1,129,059 |  |  | (158) |  |  | 1,136,996 |
Other | 1,500 |  |  | — |  |  | 16 |  |  | 1,484 |  |  | — |  |  | 1,500 |
Total | $ | 1,665,623 |  |  | $ | 3,622 |  |  | $ | 29,252 |  |  | $ | 1,639,993 |  |  | $ | (158) |  |  | $ | 1,665,465 |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 527,264 |  |  | $ | 18,766 |  |  | $ | — |  |  | $ | 546,030 |  |  | $ | — |  |  | $ | 527,264 |
States and political subdivisions | 1,220,573 |  |  | 41,141 |  |  | 101 |  |  | 1,261,613 |  |  | (158) |  |  | 1,220,415 |
Other | 1,500 |  |  | — |  |  | — |  |  | 1,500 |  |  | — |  |  | 1,500 |
Total | $ | 1,749,337 |  |  | $ | 59,907 |  |  | $ | 101 |  |  | $ | 1,809,143 |  |  | $ | (158) |  |  | $ | 1,749,179 |
Moody's and Standard & Poor's Bond Ratings [Table Text Block] | The following table summarizes Moody's and/or Standard & Poor's bond ratings for our portfolio of held-to-maturity securities issued by States and political subdivisions and other securities as of March 31, 2022 and December 31, 2021:
| States and Political Subdivisions |  |
| Not Guaranteed or Pre-Refunded |  | Guaranteed by the Texas PSF |  | Pre-Refunded |  | Total |  | Other Securities
March 31, 2022 |  |  |  |  |  |  |  |  |
Aaa/AAA | $ | 91,034 |  |  | $ | 467,039 |  |  | $ | 471,183 |  |  | $ | 1,029,256 |  |  | $ | — |
Aa/AA | 107,898 |  |  | — |  |  | — |  |  | 107,898 |  |  | — |
Not rated | — |  |  | — |  |  | — |  |  | — |  |  | 1,500 |
Total | $ | 198,932 |  |  | $ | 467,039 |  |  | $ | 471,183 |  |  | $ | 1,137,154 |  |  | $ | 1,500 |
December 31, 2021 |  |  |  |  |  |  |  |  |
Aaa/AAA | $ | 92,379 |  |  | $ | 460,648 |  |  | $ | 563,251 |  |  | $ | 1,116,278 |  |  | $ | — |
Aa/AA | 104,295 |  |  | — |  |  | — |  |  | 104,295 |  |  | — |
Not rated | — |  |  | — |  |  | — |  |  | — |  |  | 1,500 |
Total | $ | 196,674 |  |  | $ | 460,648 |  |  | $ | 563,251 |  |  | $ | 1,220,573 |  |  | $ | 1,500 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block] | The following table details activity in the allowance for credit losses on held-to-maturity securities during the three months ended March 31, 2022 and 2021.
|  |  | Three Months Ended March 31,
|  |  |  |  | 2022 |  | 2021
Beginning balance |  |  |  |  | $ | 158 |  |  | $ | 160 |
Credit loss expense (benefit) |  |  |  |  | — |  |  | (2) |
Ending balance |  |  |  |  | $ | 158 |  |  | $ | 158 |
Amortized Cost, Estimated Fair Value and Allowance for Credit Losses of Securities Available for Sale | A summary of the amortized cost, fair value and allowance for credit losses related to securities available for sale as of March 31, 2022 and December 31, 2021 is presented below.
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Estimated Fair Value
March 31, 2022 |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 3,658,506 |  |  | $ | 1,883 |  |  | $ | 152,643 |  |  | $ | — |  |  | $ | 3,507,746 |
Residential mortgage-backed securities | 5,696,906 |  |  | 7,246 |  |  | 328,113 |  |  | — |  |  | 5,376,039 |
States and political subdivisions | 7,218,821 |  |  | 135,206 |  |  | 95,634 |  |  | — |  |  | 7,258,393 |
Other | 42,361 |  |  | — |  |  | — |  |  | — |  |  | 42,361 |
Total | $ | 16,616,594 |  |  | $ | 144,335 |  |  | $ | 576,390 |  |  | $ | — |  |  | $ | 16,184,539 |
December 31, 2021 |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 2,165,702 |  |  | $ | 23,333 |  |  | $ | 9,602 |  |  | $ | — |  |  | $ | 2,179,433 |
Residential mortgage-backed securities | 4,059,692 |  |  | 31,662 |  |  | 25,089 |  |  | — |  |  | 4,066,265 |
States and political subdivisions | 7,178,135 |  |  | 463,810 |  |  | 5,374 |  |  | — |  |  | 7,636,571 |
Other | 42,359 |  |  | — |  |  | — |  |  | — |  |  | 42,359 |
Total | $ | 13,445,888 |  |  | $ | 518,805 |  |  | $ | 40,065 |  |  | $ | — |  |  | $ | 13,924,628 |
Securities, with Unrealized Losses Segregated by Length of Impairment | The table below summarizes, as of March 31, 2022, securities available for sale in an unrealized loss position for which an allowance for credit losses has not been recorded, aggregated by type of security and length of time in a continuous unrealized loss position.
| Less than 12 Months |  | More than 12 Months |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
U.S. Treasury | $ | 3,220,375 |  |  | $ | 152,643 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,220,375 |  |  | $ | 152,643 |
Residential mortgage-backed securities | 4,583,657 |  |  | 286,421 |  |  | 402,940 |  |  | 41,692 |  |  | 4,986,597 |  |  | 328,113 |
States and political subdivisions | 1,233,614 |  |  | 93,136 |  |  | 13,602 |  |  | 2,498 |  |  | 1,247,216 |  |  | 95,634 |
Total | $ | 9,037,646 |  |  | $ | 532,200 |  |  | $ | 416,542 |  |  | $ | 44,190 |  |  | $ | 9,454,188 |  |  | $ | 576,390 |
Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity | The following table summarizes the maturity distribution schedule of securities held to maturity and securities available for sale as of March 31, 2022. Mortgage-backed securities are included in maturity categories based on their stated maturity date. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Other securities classified as available for sale include stock in the Federal Reserve Bank and the Federal Home Loan Bank, which have no maturity date. These securities have been included in the total column only.
| Within 1 Year |  | 1 - 5 Years |  | 5 - 10 Years |  | After 10 Years |  | Total
Held To Maturity |  |  |  |  |  |  |  |  |
Amortized Cost |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 16 |  |  | $ | — |  |  | $ | 514,842 |  |  | $ | 12,111 |  |  | $ | 526,969 |
States and political subdivisions | 429,852 |  |  | 118,516 |  |  | 56,735 |  |  | 532,051 |  |  | 1,137,154 |
Other | — |  |  | 1,500 |  |  | — |  |  | — |  |  | 1,500 |
Total | $ | 429,868 |  |  | $ | 120,016 |  |  | $ | 571,577 |  |  | $ | 544,162 |  |  | $ | 1,665,623 |
Estimated Fair Value |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 16 |  |  | $ | — |  |  | $ | 498,078 |  |  | $ | 11,356 |  |  | $ | 509,450 |
States and political subdivisions | 431,961 |  |  | 119,698 |  |  | 56,973 |  |  | 520,427 |  |  | 1,129,059 |
Other | — |  |  | 1,484 |  |  | — |  |  | — |  |  | 1,484 |
Total | $ | 431,977 |  |  | $ | 121,182 |  |  | $ | 555,051 |  |  | $ | 531,783 |  |  | $ | 1,639,993 |
Available For Sale |  |  |  |  |  |  |  |  |
Amortized Cost |  |  |  |  |  |  |  |  |
U. S. Treasury | $ | — |  |  | $ | 2,033,995 |  |  | $ | 1,432,731 |  |  | $ | 191,780 |  |  | $ | 3,658,506 |
Residential mortgage-backed securities | 102 |  |  | 12,917 |  |  | 19,060 |  |  | 5,664,827 |  |  | 5,696,906 |
States and political subdivisions | 194,416 |  |  | 1,563,829 |  |  | 888,489 |  |  | 4,572,087 |  |  | 7,218,821 |
Other | — |  |  | — |  |  | — |  |  | — |  |  | 42,361 |
Total | $ | 194,518 |  |  | $ | 3,610,741 |  |  | $ | 2,340,280 |  |  | $ | 10,428,694 |  |  | $ | 16,616,594 |
Estimated Fair Value |  |  |  |  |  |  |  |  |
U. S. Treasury | $ | — |  |  | $ | 1,978,865 |  |  | $ | 1,350,553 |  |  | $ | 178,328 |  |  | $ | 3,507,746 |
Residential mortgage-backed securities | 103 |  |  | 13,212 |  |  | 19,327 |  |  | 5,343,397 |  |  | 5,376,039 |
States and political subdivisions | 197,231 |  |  | 1,603,985 |  |  | 899,602 |  |  | 4,557,575 |  |  | 7,258,393 |
Other | — |  |  | — |  |  | — |  |  | — |  |  | 42,361 |
Total | $ | 197,334 |  |  | $ | 3,596,062 |  |  | $ | 2,269,482 |  |  | $ | 10,079,300 |  |  | $ | 16,184,539 |
Investment Income | Premium amortization and discount accretion included in interest income on securities was as follows:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2022 |  | 2021
Premium amortization |  |  |  |  | $ | (29,060) |  |  | $ | (31,235) |
Discount accretion |  |  |  |  | 1,406 |  |  | 637 |
Net (premium amortization) discount accretion |  |  |  |  | $ | (27,654) |  |  | $ | (30,598) |
Trading Account Securities, at Estimated Fair Value | Trading account securities, at estimated fair value, were as follows:
| March 31, 2022 |  | December 31, 2021
U.S. Treasury | $ | 23,939 |  |  | $ | 24,237 |
States and political subdivisions | 5,579 |  |  | 925 |
Total | $ | 29,518 |  |  | $ | 25,162 |
Net Gains and Losses on Trading Account Securities | Net gains and losses on trading account securities were as follows:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2022 |  | 2021
Net gain on sales transactions |  |  |  |  | $ | 340 |  |  | $ | 109 |
Net mark-to-market gains (losses) |  |  |  |  | (168) |  |  | (69) |
Net gain (loss) on trading account securities |  |  |  |  | $ | 172 |  |  | $ | 40 |

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