Fair Value Measurements (Tables)

9 Months Ended

Sep. 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 September 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
September 30, 2023
Securities available for sale:
U.S. Treasury	$	5,043,152	$	—	$	—	$	5,043,152
Residential mortgage-backed securities	—		6,306,634		—		6,306,634
States and political subdivisions	—		4,724,633		—		4,724,633
Other	—		42,670		—		42,670
Trading account securities:
U.S. Treasury	29,065		—		—		29,065
States and political subdivisions	—		276		—		276
Derivative assets:
Interest rate swaps, caps, and floors	—		110,097		—		110,097
Commodity swaps and options	—		76,019		—		76,019
Derivative liabilities:
Interest rate swaps, caps, and floors	—		110,097		—		110,097
Commodity swaps and options	—		74,607		—		74,607
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.

	Nine Months Ended September 30, 2023				Nine Months Ended September 30, 2022
	Level 2		Level 3		Level 2		Level 3
Carrying value before allocations	$	20,051	$	24,921	$	7,999	$	2,087
Specific (allocations) reversals of prior allocations	(1,452)		(4,849)		(1,742)		4,881
Fair value	$	18,599	$	20,072	$	6,257	$	6,968

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:

	September 30, 2023				December 31, 2022
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 2 inputs:
Cash and cash equivalents	$	7,618,083	$	7,618,083	$	12,028,132	$	12,028,132
Securities held to maturity	3,628,123		3,231,691		2,639,083		2,467,865
Accrued interest receivable	199,344		199,344		243,682		243,682
Level 3 inputs:
Loans, net	18,157,024		17,496,332		16,927,348		16,343,417
Financial liabilities:
Level 2 inputs:
Deposits	40,992,235		40,971,688		43,954,196		43,920,741
Federal funds purchased	25,950		25,950		51,650		51,650
Repurchase agreements	3,722,245		3,722,245		4,660,641		4,660,641
Junior subordinated deferrable interest debentures	123,112		123,712		123,069		123,712
Subordinated notes	99,452		94,311		99,335		97,014
Accrued interest payable	51,468		51,468		18,444		18,444