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Loans and Allowances for Credit Losses, Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 6,366,303	$ 6,603,265
Loans, variable rate of interest	16,069,050	13,468,356
Loans, non-accrual	121,797	134,059
Total	22,557,150	20,205,680
Foregone interest on nonaccrual loans	6,796	14,102
Credit Commitments [Abstract]
Outstanding commitments to extend credit	15,400,000
Outstanding commercial letters of credit	740,000
Geographic Concentration Risk [Member] | Texas [Member]
Loans receivables disclosure [Abstract]
Total	$ 7,300,000	$ 6,800,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Texas (in hundredths)	32.00%	34.00%
Geographic Concentration Risk [Member] | Oklahoma [Member]
Loans receivables disclosure [Abstract]
Total	$ 3,500,000	$ 3,200,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Oklahoma (in hundredths)	16.00%	16.00%
Geographic Concentration Risk [Member] | Colorado [Member]
Loans receivables disclosure [Abstract]
Total	$ 2,500,000	$ 2,500,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Colorado (in hundredths)	11.00%	12.00%
Commercial [Member]
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 3,378,110	$ 3,360,117
Loans, variable rate of interest	10,759,780	9,072,244
Loans, non-accrual	60,297	74,104
Total	14,198,187	12,506,465
Commercial [Member] | Geographic Concentration Risk [Member] | Texas [Member]
Loans receivables disclosure [Abstract]
Total	$ 4,700,000	$ 4,400,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Texas (in hundredths)	33.00%	35.00%
Commercial [Member] | Geographic Concentration Risk [Member] | Oklahoma [Member]
Loans receivables disclosure [Abstract]
Total	$ 2,100,000	$ 1,700,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Oklahoma (in hundredths)	15.00%	13.00%
Commercial [Member] | Geographic Concentration Risk [Member] | Colorado [Member]
Loans receivables disclosure [Abstract]
Total	$ 1,800,000	$ 1,600,000
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Colorado (in hundredths)	12.00%	13.00%
Commercial [Member] | Services [Member]
Loans receivable, other information [Abstract]
Amount of loans with individual balances less than $10 million	$ 1,600,000	$ 1,700,000
Commercial [Member] | Services [Member] | Credit Concentration Risk [Member]
Loans receivables disclosure [Abstract]
Total	$ 3,400,000	$ 3,400,000
Loans receivable, other information [Abstract]
Percentage of loan class to total loans	15.00%	17.00%
Commercial [Member] | Energy [Member] | Credit Concentration Risk [Member]
Loans receivables disclosure [Abstract]
Total	$ 3,400,000	$ 3,000,000
Loans receivable, other information [Abstract]
Percentage of loan class to total loans	15.00%	15.00%
Commercial [Member] | Energy Producers [Member] | Credit Concentration Risk [Member]
Loans receivables disclosure [Abstract]
Total	$ 2,700,000	$ 2,200,000
Loans receivable, other information [Abstract]
Percentage of committed energy production loans secured by oil	72.00%	67.00%
Percentage of committed energy production loans secured by natural gas	28.00%	33.00%
Commercial [Member] | Healthcare [Member] | Credit Concentration Risk [Member]
Loans receivables disclosure [Abstract]
Total	$ 3,800,000	$ 3,400,000
Loans receivable, other information [Abstract]
Percentage of loan class to total loans	17.00%	17.00%
Commercial real estate [Member]
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 874,716	$ 929,015
Loans, variable rate of interest	3,715,491	2,888,048
Loans, non-accrual	16,570	14,262
Total	$ 4,606,777	$ 3,831,325
Commercial real estate [Member] | Geographic Concentration Risk [Member] | Texas [Member]
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Texas (in hundredths)	30.00%	30.00%
Commercial real estate [Member] | Geographic Concentration Risk [Member] | Oklahoma [Member]
Loans receivable, other information [Abstract]
Percentage of loan portfolio secured by property in Oklahoma (in hundredths)	9.00%	12.00%
Paycheck Protection Program
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 14,312	$ 276,341
Loans, variable rate of interest	0	0
Loans, non-accrual	0	0
Total	14,312	276,341
Loans to individuals [Member]
Loans receivables disclosure [Abstract]
Loans, fixed rate of interest	2,099,165	2,037,792
Loans, variable rate of interest	1,593,779	1,508,064
Loans, non-accrual	44,930	45,693
Total	$ 3,737,874	$ 3,591,549
Loans receivable, other information [Abstract]
Percentage of personal loans secured by collateral in our geographical footprint	91.00%

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