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Loans and Allowances for Credit Losses, Loans by Portfolio Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest | $ 6,682,476 | $ 6,134,362
Loans, variable rate of interest | 16,090,351 | 15,435,674
Loans, non-accrual | 234,693 | 180,951
Total | 23,007,520 | 21,750,987
Past Due 90 Days or More and Accruing | 88,718 | 7,680
Foregone interest on nonaccrual loans | 22,870 | 17,409
Credit Commitments [Abstract] |  |
Outstanding commitments to extend credit | 11,000,000 |
Outstanding standby letters of credit | 681,000 |
Geographic Concentration Risk [Member] | Texas [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 7,200,000 | $ 6,800,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Texas (in hundredths) | 31.00% | 31.00%
Geographic Concentration Risk [Member] | Oklahoma [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 3,800,000 | $ 3,500,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Oklahoma (in hundredths) | 17.00% | 16.00%
Geographic Concentration Risk [Member] | Colorado [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 2,800,000 | $ 2,800,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Colorado (in hundredths) | 12.00% | 13.00%
Commercial [Member] |  |
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest | $ 1,805,286 | $ 3,231,485
Loans, variable rate of interest | 11,105,090 | 10,684,749
Loans, non-accrual | 167,159 | 115,416
Total | 13,077,535 | 14,031,650
Past Due 90 Days or More and Accruing | 4,821 |
Commercial [Member] | Geographic Concentration Risk [Member] | Texas [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 4,300,000 | $ 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 | $ 2,000,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Oklahoma (in hundredths) | 14.00% | 14.00%
Commercial [Member] | Geographic Concentration Risk [Member] | Colorado [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 1,700,000 | $ 2,000,000
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Colorado (in hundredths) | 13.00% | 14.00%
Commercial [Member] | Services [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 3,508,583 | $ 3,122,163
Past Due 90 Days or More and Accruing | 326 |
Loans receivable, other information [Abstract] |  |
Amount of loans with individual balances less than $10 million | 1,800,000 | 1,500,000
Commercial [Member] | Services [Member] | Credit Concentration Risk [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 3,500,000 | $ 3,800,000
Loans receivable, other information [Abstract] |  |
Percentage of loan class to total loans | 15.00% | 18.00%
Commercial [Member] | Energy [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 3,469,194 | $ 3,973,377
Past Due 90 Days or More and Accruing | 0 |
Commercial [Member] | Energy [Member] | Credit Concentration Risk [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 3,500,000 | $ 4,000,000
Loans receivable, other information [Abstract] |  |
Percentage of loan class to total loans | 15.00% | 18.00%
Commercial [Member] | Energy Producers [Member] | Credit Concentration Risk [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 2,600,000 | $ 3,100,000
Loans receivable, other information [Abstract] |  |
Percentage of committed energy production loans secured by oil | 67.00% | 58.00%
Percentage of committed energy production loans secured by natural gas | 33.00% | 42.00%
Commercial [Member] | Healthcare [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 3,305,990 | $ 3,033,916
Past Due 90 Days or More and Accruing | 0 |
Commercial [Member] | Healthcare [Member] | Credit Concentration Risk [Member] |  |
Loans receivables disclosure [Abstract] |  |
Total | $ 3,300,000 | $ 3,000,000
Loans receivable, other information [Abstract] |  |
Percentage of loan class to total loans | 14.00% | 14.00%
Commercial real estate [Member] |  |
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest | $ 1,021,443 | $ 1,056,321
Loans, variable rate of interest | 3,649,849 | 3,349,836
Loans, non-accrual | 27,246 | 27,626
Total | 4,698,538 | $ 4,433,783
Past Due 90 Days or More and Accruing | $ 5,126 |
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) | 27.00% | 24.00%
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) | 10.00% | 12.00%
Commercial real estate [Member] | Geographic Concentration Risk [Member] | Colorado [Member] |  |
Loans receivable, other information [Abstract] |  |
Percentage of loan portfolio secured by property in Colorado (in hundredths) |  | 11.00%
Paycheck Protection Program |  |
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest | $ 1,682,310 |
Loans, variable rate of interest | 0 |
Loans, non-accrual | 0 |
Total | 1,682,310 |
Past Due 90 Days or More and Accruing | 0 |
Loans to individuals [Member] |  |
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest | 2,173,437 |
Loans, variable rate of interest | 1,335,412 |
Loans, non-accrual | 40,288 |
Total | 3,549,137 |
Past Due 90 Days or More and Accruing | $ 78,771 |
Loans receivable, other information [Abstract] |  |
Percentage of personal loans secured by collateral in our geographical footprint | 91.00% |
Loans to individuals [Member] | Residential Mortgage [Member] |  |
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest |  | $ 1,652,653
Loans, variable rate of interest |  | 393,897
Loans, non-accrual |  | 37,622
Total |  | 2,084,172
Loans to individuals [Member] | Personal [Member] |  |
Loans receivables disclosure [Abstract] |  |
Loans, fixed rate of interest |  | 193,903
Loans, variable rate of interest |  | 1,007,192
Loans, non-accrual |  | 287
Total | $ 1,277,447 | $ 1,201,382
Past Due 90 Days or More and Accruing | $ 241 |

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