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Loans and Allowances for Credit Losses, Loans by Portfolio Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest | $ 6,633,234 | $ 6,366,303
Loans, variable rate of interest | 17,126,265 | 16,069,050
Loans, non-accrual | 145,469 | 121,797
Total | 23,904,968 | 22,557,150
Foregone interest on nonaccrual loans | 7,863 | 6,796
Credit Commitments [Abstract] |  |
Outstanding commitments to extend credit | 14,800,000 |
Outstanding commercial letters of credit | 711,000 |
Geographic Concentration Risk [Member] | Texas [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 7,600,000 | $ 7,300,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Texas (in hundredths) | 32.00% | 32.00%
Geographic Concentration Risk [Member] | Oklahoma [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 3,300,000 | $ 3,500,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Oklahoma (in hundredths) | 14.00% | 16.00%
Geographic Concentration Risk [Member] | Colorado [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 2,700,000 | $ 2,500,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Colorado (in hundredths) | 11.00% | 11.00%
Commercial [Member] |  |
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest | $ 3,558,563 | $ 3,392,422
Loans, variable rate of interest | 11,135,075 | 10,759,780
Loans, non-accrual | 110,131 | 60,297
Total | 14,803,769 | 14,212,499
Commercial [Member] | Geographic Concentration Risk [Member] | Texas [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 4,800,000 | $ 4,700,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Texas (in hundredths) | 33.00% | 33.00%
Commercial [Member] | Geographic Concentration Risk [Member] | Oklahoma [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 1,800,000 | $ 2,100,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Oklahoma (in hundredths) | 12.00% | 15.00%
Commercial [Member] | Geographic Concentration Risk [Member] | Colorado [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 1,800,000 | $ 1,800,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Colorado (in hundredths) | 12.00% | 12.00%
Commercial [Member] | Healthcare [Member] | Credit Concentration Risk [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 4,100,000 | $ 3,800,000
Loans receivable, other information [Abstract] |  |
Percentage of loan class to total loans | 17.00% | 17.00%
Commercial [Member] | Services [Member] |  |
Loans receivable, other information [Abstract] |  |
Amount of loans with individual balances less than $10 million | $ 1,600,000 | $ 1,600,000
Commercial [Member] | Services [Member] | Credit Concentration Risk [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 3,600,000 | $ 3,400,000
Loans receivable, other information [Abstract] |  |
Percentage of loan class to total loans | 15.00% | 15.00%
Commercial [Member] | Energy [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 | 14.00% | 15.00%
Commercial [Member] | Energy Producers [Member] | Credit Concentration Risk [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 2,700,000 | $ 2,700,000
Loans receivable, other information [Abstract] |  |
Percentage of committed energy production loans secured by oil | 69.00% | 72.00%
Percentage of committed energy production loans secured by natural gas | 31.00% | 28.00%
Commercial real estate [Member] |  |
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest | $ 791,757 | $ 874,716
Loans, variable rate of interest | 4,538,570 | 3,715,491
Loans, non-accrual | 7,320 | 16,570
Total | $ 5,337,647 | $ 4,606,777
Commercial real estate [Member] | Geographic Concentration Risk [Member] |  |
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in all other states (in hundredths) | 10.00% | 10.00%
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) | 31.00% | 30.00%
Loans to individuals [Member] |  |
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest | $ 2,282,914 | $ 2,099,165
Loans, variable rate of interest | 1,452,620 | 1,593,779
Loans, non-accrual | 28,018 | 44,930
Total | $ 3,763,552 | $ 3,737,874
Loans receivable, other information [Abstract] |  |
Percentage of personal loans secured by collateral in our geographical footprint | 91.00% |

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