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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2023
Fair Value Disclosures [Abstract] |
Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis | The tables below summarize financial assets and financial liabilities measured at fair value on a recurring basis as of June 30, 2023 and December 31, 2022, segregated by the level of the valuation inputs within the fair value hierarchy of ASC Topic 820 utilized to measure fair value.
| Level 1 Inputs |  | Level 2 Inputs |  | Level 3 Inputs |  | Total Fair Value
June 30, 2023 |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |
U.S. Treasury | $ | 5,072,888 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,072,888 |
Residential mortgage-backed securities | — |  |  | 6,792,775 |  |  | — |  |  | 6,792,775 |
States and political subdivisions | — |  |  | 5,341,016 |  |  | — |  |  | 5,341,016 |
Other | — |  |  | 42,578 |  |  | — |  |  | 42,578 |
Trading account securities: |  |  |  |  |  |  |
U.S. Treasury | 27,546 |  |  | — |  |  | — |  |  | 27,546 |
States and political subdivisions | — |  |  | 4,971 |  |  | — |  |  | 4,971 |
Derivative assets: |  |  |  |  |  |  |
Interest rate swaps, caps and floors | — |  |  | 94,362 |  |  | — |  |  | 94,362 |
Commodity swaps and options | — |  |  | 65,814 |  |  | — |  |  | 65,814 |
Derivative liabilities: |  |  |  |  |  |  |
Interest rate swaps, caps and floors | — |  |  | 94,291 |  |  | — |  |  | 94,291 |
Commodity swaps and options | — |  |  | 64,802 |  |  | — |  |  | 64,802 |
December 31, 2022 |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |
U.S. Treasury | $ | 5,051,587 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,051,587 |
Residential mortgage-backed securities | — |  |  | 6,376,236 |  |  | — |  |  | 6,376,236 |
States and political subdivisions | — |  |  | 6,773,355 |  |  | — |  |  | 6,773,355 |
Other | — |  |  | 42,427 |  |  | — |  |  | 42,427 |
Trading account securities: |  |  |  |  |  |  |
U.S. Treasury | 25,879 |  |  | — |  |  | — |  |  | 25,879 |
States and political subdivisions | — |  |  | 2,166 |  |  | — |  |  | 2,166 |
Derivative assets: |  |  |  |  |  |  |
Interest rate swaps, caps and floors | — |  |  | 86,793 |  |  | — |  |  | 86,793 |
Commodity swaps and options | — |  |  | 106,685 |  |  | — |  |  | 106,685 |
Foreign currency forward contracts | 11 |  |  | — |  |  | — |  |  | 11 |
Derivative liabilities: |  |  |  |  |  |  |
Interest rate swaps, caps and floors | — |  |  | 95,533 |  |  | — |  |  | 95,533 |
Commodity swaps and options | — |  |  | 105,392 |  |  | — |  |  | 105,392 |
Foreign currency forward contracts | 11 |  |  | — |  |  | — |  |  | 11 |
Impaired Loans Remeasured And Reported At Fair Value Specific Valuation Allowance Allocation Method Of Underlying Collateral [Table Text Block] | The following table presents collateral dependent loans that were remeasured and reported at fair value through a specific allocation of the allowance for credit losses on loans based upon the fair value of the underlying collateral during the reported periods.
| Six Months Ended June 30, 2023 |  | Six Months Ended June 30, 2022
| Level 2 |  | Level 3 |  | Level 2 |  | Level 3
Carrying value before allocations | $ | 19,064 |  |  | $ | 20,171 |  |  | $ | 5,454 |  |  | $ | 3,614 |
Specific (allocations) reversals of prior allocations | (1,300) |  |  | (2,100) |  |  | (1,327) |  |  | 6,877 |
Fair value | $ | 17,764 |  |  | $ | 18,071 |  |  | $ | 4,127 |  |  | $ | 10,491 |
Estimated Fair Values of Financial Instruments | The estimated fair values of financial instruments that are reported at amortized cost in our consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows:
| June 30, 2023 |  | December 31, 2022
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
Financial assets: |  |  |  |  |  |  |
Level 2 inputs: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 7,107,336 |  |  | $ | 7,107,336 |  |  | $ | 12,028,132 |  |  | $ | 12,028,132 |
Securities held to maturity | 3,691,220 |  |  | 3,543,929 |  |  | 2,639,083 |  |  | 2,467,865 |
Cash surrender value of life insurance policies | 190,575 |  |  | 190,575 |  |  | 190,188 |  |  | 190,188 |
Accrued interest receivable | 236,967 |  |  | 236,967 |  |  | 243,682 |  |  | 243,682 |
Level 3 inputs: |  |  |  |  |  |  |
Loans, net | 17,512,692 |  |  | 16,933,702 |  |  | 16,927,348 |  |  | 16,343,417 |
Financial liabilities: |  |  |  |  |  |  |
Level 2 inputs: |  |  |  |  |  |  |
Deposits | 40,700,830 |  |  | 40,683,556 |  |  | 43,954,196 |  |  | 43,920,741 |
Federal funds purchased | 13,525 |  |  | 13,525 |  |  | 51,650 |  |  | 51,650 |
Repurchase agreements | 3,569,870 |  |  | 3,569,870 |  |  | 4,660,641 |  |  | 4,660,641 |
Junior subordinated deferrable interest debentures | 123,098 |  |  | 123,712 |  |  | 123,069 |  |  | 123,712 |
Subordinated notes | 99,413 |  |  | 94,571 |  |  | 99,335 |  |  | 97,014 |
Accrued interest payable | 40,523 |  |  | 40,523 |  |  | 18,444 |  |  | 18,444 |

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