Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2022

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, 2022 and December 31, 2021, 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, 2022
Securities available for sale:
U.S. Treasury	$	5,022,617	$	—	$	—	$	5,022,617
Residential mortgage-backed securities	—		5,698,809		—		5,698,809
States and political subdivisions	—		6,635,298		—		6,635,298
Other	—		42,383		—		42,383
Trading account securities:
U.S. Treasury	25,008		—		—		25,008
Derivative assets:
Interest rate swaps, caps and floors	—		78,898		—		78,898
Commodity swaps and options	—		145,933		—		145,933
Foreign currency forward contracts	252		—		—		252
Derivative liabilities:
Interest rate swaps, caps and floors	—		99,093		—		99,093
Commodity swaps and options	—		144,385		—		144,385
Foreign currency forward contracts	252		—		—		252
December 31, 2021
Securities available for sale:
U.S. Treasury	$	2,179,433	$	—	$	—	$	2,179,433
Residential mortgage-backed securities	—		4,066,265		—		4,066,265
States and political subdivisions	—		7,636,571		—		7,636,571
Other	—		42,359		—		42,359
Trading account securities:
U.S. Treasury	24,237		—		—		24,237
States and political subdivisions	—		925		—		925
Derivative assets:
Interest rate swaps, caps and floors	—		44,310		—		44,310
Commodity swaps and options	—		114,757		—		114,757
Foreign currency forward contracts	33		—		—		33
Derivative liabilities:
Interest rate swaps, caps and floors	—		25,261		—		25,261
Commodity swaps and options	—		113,261		—		113,261
Foreign currency forward contracts	55		—		—		55

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, 2022				Nine Months Ended September 30, 2021
	Level 2		Level 3		Level 2		Level 3
Carrying value before allocations	$	7,999	$	2,087	$	3,329	$	15,274
Specific (allocations) reversals of prior allocations	(1,742)		4,881		(336)		(4,791)
Fair value	$	6,257	$	6,968	$	2,993	$	10,483

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, 2022				December 31, 2021
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 2 inputs:
Cash and cash equivalents	$	13,632,698	$	13,632,698	$	16,583,000	$	16,583,000
Securities held to maturity	2,174,084		1,917,287		1,749,179		1,809,143
Cash surrender value of life insurance policies	190,368		190,368		190,139		190,139
Accrued interest receivable	169,540		169,540		179,111		179,111
Level 3 inputs:
Loans, net	16,716,314		16,163,170		16,087,731		16,079,454
Financial liabilities:
Level 2 inputs:
Deposits	46,560,186		46,538,352		42,695,696		41,343,426
Federal funds purchased	26,200		26,200		25,925		25,925
Repurchase agreements	2,082,739		2,082,739		2,740,799		2,740,799
Junior subordinated deferrable interest debentures	123,055		123,712		123,011		123,712
Subordinated notes	99,295		96,926		99,178		111,430
Accrued interest payable	9,545		9,545		3,026		3,026