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Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
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 June 30, 2020 and December 31, 2019 is presented below.
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Allowance for Credit Losses |  | Net Carrying Amount
June 30, 2020 |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 529,868 |  |  | $ | 45,243 |  |  | $ | — |  |  | $ | 575,111 |  |  | $ | — |  |  | $ | 529,868 |
States and political subdivisions | 1,437,758 |  |  | 59,072 |  |  | — |  |  | 1,496,830 |  |  | (172) |  |  | 1,437,586 |
Other | 1,500 |  |  | — |  |  | — |  |  | 1,500 |  |  | — |  |  | 1,500 |
Total | $ | 1,969,126 |  |  | $ | 104,315 |  |  | $ | — |  |  | $ | 2,073,441 |  |  | $ | (172) |  |  | $ | 1,968,954 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 530,861 |  |  | $ | 22 |  |  | $ | 9,365 |  |  | $ | 521,518 |  |  | $ | — |  |  | $ | 530,861 |
States and political subdivisions | 1,497,644 |  |  | 28,909 |  |  | 896 |  |  | 1,525,657 |  |  | — |  |  | 1,497,644 |
Other | 1,500 |  |  | — |  |  | — |  |  | 1,500 |  |  | — |  |  | 1,500 |
Total | $ | 2,030,005 |  |  | $ | 28,931 |  |  | $ | 10,261 |  |  | $ | 2,048,675 |  |  | $ | — |  |  | $ | 2,030,005 |
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 June 30, 2020:
| States and Political Subdivisions |  |  |  |  |  |  |  |
| Not Guaranteed or Pre-Refunded |  | Guaranteed by the Texas PSF |  | Pre-Refunded |  | Total |  | Other Securities
Aaa/AAA | $ | 131,304 |  |  | $ | 840,004 |  |  | $ | 292,036 |  |  | $ | 1,263,344 |  |  | $ | — |
Aa/AA | 111,427 |  |  | — |  |  | — |  |  | 111,427 |  |  | — |
A | 62,987 |  |  | — |  |  | — |  |  | 62,987 |  |  | — |
Not rated | — |  |  | — |  |  | — |  |  | — |  |  | 1,500 |
Total | $ | 305,718 |  |  | $ | 840,004 |  |  | $ | 292,036 |  |  | $ | 1,437,758 |  |  | $ | 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 and six months ended June 30, 2020.
| Three Months Ended June 30, 2020 |  | Six Months Ended June 30, 2020
Beginning balance | $ | 200 |  |  | $ | — |
Impact of adopting ASC 326 | — |  |  | 215 |
Credit loss expense (benefit) | (28) |  |  | (43) |
Ending balance | $ | 172 |  |  | $ | 172 |
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 June 30, 2020 and December 31, 2019 is presented below.
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Estimated Fair Value
June 30, 2020 |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 1,117,867 |  |  | $ | 45,768 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,163,635 |
Residential mortgage-backed securities | 2,051,686 |  |  | 79,604 |  |  | 3 |  |  | — |  |  | 2,131,287 |
States and political subdivisions | 6,725,404 |  |  | 544,091 |  |  | — |  |  | — |  |  | 7,269,495 |
Other | 42,279 |  |  | — |  |  | — |  |  | — |  |  | 42,279 |
Total | $ | 9,937,236 |  |  | $ | 669,463 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 10,606,696 |
December 31, 2019 |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 1,941,283 |  |  | $ | 18,934 |  |  | $ | 12,084 |  |  | $ | — |  |  | $ | 1,948,133 |
Residential mortgage-backed securities | 2,176,275 |  |  | 32,608 |  |  | 1,289 |  |  | — |  |  | 2,207,594 |
States and political subdivisions | 6,717,344 |  |  | 353,857 |  |  | 204 |  |  | — |  |  | 7,070,997 |
Other | 42,867 |  |  | — |  |  | — |  |  | — |  |  | 42,867 |
Total | $ | 10,877,769 |  |  | $ | 405,399 |  |  | $ | 13,577 |  |  | $ | — |  |  | $ | 11,269,591 |
Securities, with Unrealized Losses Segregated by Length of Impairment | The table below summarizes, as of June 30, 2020, 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
Residential mortgage-backed securities | $ | 1,243 |  |  | $ | 2 |  |  | $ | 127 |  |  | $ | 1 |  |  | $ | 1,370 |  |  | $ | 3 |
Total | $ | 1,243 |  |  | $ | 2 |  |  | $ | 127 |  |  | $ | 1 |  |  | $ | 1,370 |  |  | $ | 3 |
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 June 30, 2020. 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 | $ | — |  |  | $ | 285 |  |  | $ | 516,618 |  |  | $ | 12,965 |  |  | $ | 529,868 |
States and political subdivisions | 25,717 |  |  | 339,996 |  |  | 425,582 |  |  | 646,463 |  |  | 1,437,758 |
Other | — |  |  | 1,500 |  |  | — |  |  | — |  |  | 1,500 |
Total | $ | 25,717 |  |  | $ | 341,781 |  |  | $ | 942,200 |  |  | $ | 659,428 |  |  | $ | 1,969,126 |
Estimated Fair Value |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | — |  |  | $ | 287 |  |  | $ | 560,606 |  |  | $ | 14,218 |  |  | $ | 575,111 |
States and political subdivisions | 25,991 |  |  | 353,852 |  |  | 439,542 |  |  | 677,445 |  |  | 1,496,830 |
Other | — |  |  | 1,500 |  |  | — |  |  | — |  |  | 1,500 |
Total | $ | 25,991 |  |  | $ | 355,639 |  |  | $ | 1,000,148 |  |  | $ | 691,663 |  |  | $ | 2,073,441 |
Available For Sale |  |  |  |  |  |  |  |  |
Amortized Cost |  |  |  |  |  |  |  |  |
U. S. Treasury | $ | 33,986 |  |  | $ | 1,083,881 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,117,867 |
Residential mortgage-backed securities | 126 |  |  | 57,223 |  |  | 5,424 |  |  | 1,988,913 |  |  | 2,051,686 |
States and political subdivisions | 241,102 |  |  | 411,156 |  |  | 658,064 |  |  | 5,415,082 |  |  | 6,725,404 |
Other | — |  |  | — |  |  | — |  |  | — |  |  | 42,279 |
Total | $ | 275,214 |  |  | $ | 1,552,260 |  |  | $ | 663,488 |  |  | $ | 7,403,995 |  |  | $ | 9,937,236 |
Estimated Fair Value |  |  |  |  |  |  |  |  |
U. S. Treasury | $ | 34,067 |  |  | $ | 1,129,568 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,163,635 |
Residential mortgage-backed securities | 133 |  |  | 59,793 |  |  | 5,967 |  |  | 2,065,394 |  |  | 2,131,287 |
States and political subdivisions | 243,001 |  |  | 444,100 |  |  | 714,089 |  |  | 5,868,305 |  |  | 7,269,495 |
Other | — |  |  | — |  |  | — |  |  | — |  |  | 42,279 |
Total | $ | 277,201 |  |  | $ | 1,633,461 |  |  | $ | 720,056 |  |  | $ | 7,933,699 |  |  | $ | 10,606,696 |
Sales of Securities Available for Sale | Sales of securities available for sale were as follows:
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Proceeds from sales | $ | 51,250 |  |  | $ | 2,346,626 |  |  | $ | 1,162,352 |  |  | $ | 3,291,529 |
Gross realized gains | — |  |  | 803 |  |  | 108,989 |  |  | 803 |
Gross realized losses | — |  |  | (634) |  |  | — |  |  | (634) |
Tax (expense) benefit of securities gains/losses | — |  |  | (35) |  |  | (22,888) |  |  | (35) |
Premium Amortization and Discount Accretion Included in Income on Securities [Table Text Block] | Premium amortization and discount accretion included in interest income on securities was as follows:
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Premium amortization | $ | (30,988) |  |  | $ | (29,408) |  |  | $ | (63,333) |  |  | $ | (59,287) |
Discount accretion | 571 |  |  | 1,378 |  |  | 1,156 |  |  | 2,561 |
Net (premium amortization) discount accretion | $ | (30,417) |  |  | $ | (28,030) |  |  | $ | (62,177) |  |  | $ | (56,726) |
Trading Account Securities, at Estimated Fair Value | Trading account securities, at estimated fair value, were as follows:
| June 30, 2020 |  | December 31, 2019
U.S. Treasury | $ | 24,495 |  |  | $ | 24,298 |
Total | $ | 24,495 |  |  | $ | 24,298 |
Net Gains and Losses on Trading Account Securities | Net gains and losses on trading account securities were as follows:
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Net gain on sales transactions | $ | 304 |  |  | $ | 552 |  |  | $ | 774 |  |  | $ | 1,058 |
Net mark-to-market gains (losses) | (22) |  |  | 27 |  |  | 93 |  |  | 31 |
Net gain (loss) on trading account securities | $ | 282 |  |  | $ | 579 |  |  | $ | 867 |  |  | $ | 1,089 |

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