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Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities | A summary of the amortized cost and estimated fair value of securities, excluding trading securities, is presented below.
| June 30, 2019 |  | December 31, 2018
| 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 2,554 |  |  | $ | 13 |  |  | $ | 4 |  |  | $ | 2,563 |  |  | $ | 2,737 |  |  | $ | 8 |  |  | $ | 85 |  |  | $ | 2,660 |
States and political subdivisions | 1,031,245 |  |  | 26,670 |  |  | — |  |  | 1,057,915 |  |  | 1,101,820 |  |  | 11,525 |  |  | 552 |  |  | 1,112,793 |
Other | 1,500 |  |  | — |  |  | — |  |  | 1,500 |  |  | 1,500 |  |  | — |  |  | — |  |  | 1,500 |
Total | $ | 1,035,299 |  |  | $ | 26,683 |  |  | $ | 4 |  |  | $ | 1,061,978 |  |  | $ | 1,106,057 |  |  | $ | 11,533 |  |  | $ | 637 |  |  | $ | 1,116,953 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 2,907,476 |  |  | $ | 18,187 |  |  | $ | 4,943 |  |  | $ | 2,920,720 |  |  | $ | 3,455,417 |  |  | $ | 1,772 |  |  | $ | 29,500 |  |  | $ | 3,427,689 |
Residential mortgage-backed securities | 2,212,761 |  |  | 36,354 |  |  | 1,403 |  |  | 2,247,712 |  |  | 823,208 |  |  | 13,079 |  |  | 6,547 |  |  | 829,740 |
States and political subdivisions | 6,783,505 |  |  | 287,668 |  |  | 2,872 |  |  | 7,068,301 |  |  | 7,089,132 |  |  | 70,760 |  |  | 72,690 |  |  | 7,087,202 |
Other | 42,780 |  |  | — |  |  | — |  |  | 42,780 |  |  | 42,690 |  |  | — |  |  | — |  |  | 42,690 |
Total | $ | 11,946,522 |  |  | $ | 342,209 |  |  | $ | 9,218 |  |  | $ | 12,279,513 |  |  | $ | 11,410,447 |  |  | $ | 85,611 |  |  | $ | 108,737 |  |  | $ | 11,387,321 |
Securities, with Unrealized Losses Segregated by Length of Impairment | As of June 30, 2019, securities with unrealized losses, segregated by length of impairment, were as follows:
| Less than 12 Months |  | More than 12 Months |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
Held to Maturity |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | — |  |  | $ | — |  |  | $ | 900 |  |  | $ | 4 |  |  | $ | 900 |  |  | $ | 4 |
Total | $ | — |  |  | $ | — |  |  | $ | 900 |  |  | $ | 4 |  |  | $ | 900 |  |  | $ | 4 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | — |  |  | $ | — |  |  | $ | 1,819,942 |  |  | $ | 4,943 |  |  | $ | 1,819,942 |  |  | $ | 4,943 |
Residential mortgage-backed securities | 12,258 |  |  | 38 |  |  | 116,919 |  |  | 1,365 |  |  | 129,177 |  |  | 1,403 |
States and political subdivisions | 49,020 |  |  | 1,279 |  |  | 186,554 |  |  | 1,593 |  |  | 235,574 |  |  | 2,872 |
Total | $ | 61,278 |  |  | $ | 1,317 |  |  | $ | 2,123,415 |  |  | $ | 7,901 |  |  | $ | 2,184,693 |  |  | $ | 9,218 |
Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity | The amortized cost and estimated fair value of securities, excluding trading securities, at June 30, 2019 are presented below by contractual maturity. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Residential mortgage-backed securities and equity securities are shown separately since they are not due at a single maturity date.
| Held to Maturity |  | Available for Sale
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 21,334 |  |  | $ | 21,546 |  |  | $ | 1,974,510 |  |  | $ | 1,968,237 |
Due after one year through five years | 128,125 |  |  | 131,517 |  |  | 1,427,453 |  |  | 1,454,226 |
Due after five years through ten years | 534,695 |  |  | 547,279 |  |  | 400,327 |  |  | 421,390 |
Due after ten years | 348,591 |  |  | 359,073 |  |  | 5,888,691 |  |  | 6,145,168 |
Residential mortgage-backed securities | 2,554 |  |  | 2,563 |  |  | 2,212,761 |  |  | 2,247,712 |
Equity securities | — |  |  | — |  |  | 42,780 |  |  | 42,780 |
Total | $ | 1,035,299 |  |  | $ | 1,061,978 |  |  | $ | 11,946,522 |  |  | $ | 12,279,513 |
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,
| 2019 |  | 2018 |  | 2019 |  | 2018
Proceeds from sales | $ | 2,346,626 |  |  | $ | 7,905,521 |  |  | $ | 3,291,529 |  |  | $ | 10,890,388 |
Gross realized gains | 803 |  |  | 3 |  |  | 803 |  |  | 3 |
Gross realized losses | (634 | ) |  | (63 | ) |  | (634 | ) |  | (82 | )
Tax (expense) benefit of securities gains/losses | (35 | ) |  | 13 |  |  | (35 | ) |  | 17 |
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,
| 2019 |  | 2018 |  | 2019 |  | 2018
Premium amortization | $ | (29,408 | ) |  | $ | (26,689 | ) |  | $ | (59,287 | ) |  | $ | (52,723 | )
Discount accretion | 1,378 |  |  | 2,010 |  |  | 2,561 |  |  | 3,787 |
Net (premium amortization) discount accretion | $ | (28,030 | ) |  | $ | (24,679 | ) |  | $ | (56,726 | ) |  | $ | (48,936 | )
Trading Account Securities, at Estimated Fair Value | Trading account securities, at estimated fair value, were as follows:
| June 30, 2019 |  | December 31, 2018
U.S. Treasury | $ | 22,642 |  |  | $ | 21,928 |
States and political subdivisions | 2,840 |  |  | 2,158 |
Total | $ | 25,482 |  |  | $ | 24,086 |
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,
| 2019 |  | 2018 |  | 2019 |  | 2018
Net gain on sales transactions | $ | 552 |  |  | $ | 434 |  |  | $ | 1,058 |  |  | $ | 939 |
Net mark-to-market gains (losses) | 27 |  |  | 23 |  |  | 31 |  |  | (13 | )
Net gain (loss) on trading account securities | $ | 579 |  |  | $ | 457 |  |  | $ | 1,089 |  |  | $ | 926 |

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