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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | $ 94,777 | $ 83,575 | $ 67,240
Charged-off loans | (49,333) | (28,467) | (30,400)
Recovery of previously charged-off loans | 9,962 | 12,386 | 12,358
Provision for credit losses | 191,542 | 27,283 | 34,377
Ending Balance | 285,050 | 94,777 | 83,575
Collectively Evaluated for Impairment |  | 90,512 |
Individually Evaluated for Impairment |  | 3,280 |
Ending Balance | 285,050 | 94,777 | 83,575
Collectively Evaluated for Impairment |  | 19,708,817 |
Individually Evaluated for Impairment | 74,292 | 58,144 |
Loans acquired with deteriorated credit quality |  | 20,915 |
Loans | 22,424,501 | 19,787,876 |
Currently performing impaired loans | 51,700 | 35,800 |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 38,102 |  |
Nonaccrual loans | 73,836 | 61,605 |
Financial Asset Acquired with Credit Deterioration |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Individually Evaluated for Impairment |  | 0 |
Commercial Real Estate |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 33,369 |  |
Ending Balance |  | 33,369 |
Collectively Evaluated for Impairment |  | 32,134 |
Individually Evaluated for Impairment |  | 1,235 |
Ending Balance |  | 33,369 |
Collectively Evaluated for Impairment |  | 7,681,608 |
Individually Evaluated for Impairment |  | 18,122 |
Loans acquired with deteriorated credit quality |  | 9,488 |
Loans |  | 7,709,218 |
Commercial Real Estate | Financial Asset Acquired with Credit Deterioration |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Individually Evaluated for Impairment |  | 0 |
Commercial Real Estate Owner Occupied |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 13,406 | 10,575 | 8,992
Charged-off loans | (2,598) | (1,625) | (2,652)
Recovery of previously charged-off loans | 1,317 | 1,252 | 1,568
Provision for credit losses | 10,909 | 3,204 | 2,667
Ending Balance | 23,298 | 13,406 | 10,575
Ending Balance | 23,298 | 13,406 | 10,575
Individually Evaluated for Impairment | 15,681 |  |
Loans | 2,802,227 | 2,669,766 |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 264 |  |
Nonaccrual loans | 10,231 | 11,654 |
Commercial real estate non owner occupied |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 19,963 | 16,371 | 12,196
Charged-off loans | (546) | (75) | (378)
Recovery of previously charged-off loans | 911 | 980 | 528
Provision for credit losses | 63,544 | 2,687 | 4,025
Ending Balance | 79,132 | 19,963 | 16,371
Ending Balance | 79,132 | 19,963 | 16,371
Individually Evaluated for Impairment | 7,000 |  |
Loans | 5,203,384 | 5,039,452 |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | (4,740) |  |
Nonaccrual loans | 5,219 | 7,173 |
Consumer Real Estate |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 8,054 | 7,670 | 5,031
Charged-off loans | (3,478) | (1,335) | (1,593)
Recovery of previously charged-off loans | 1,493 | 1,827 | 2,653
Provision for credit losses | 6,206 | (108) | 1,579
Ending Balance | 33,304 | 8,054 | 7,670
Collectively Evaluated for Impairment |  | 6,762 |
Individually Evaluated for Impairment |  | 1,292 |
Ending Balance | 33,304 | 8,054 | 7,670
Collectively Evaluated for Impairment |  | 3,036,922 |
Individually Evaluated for Impairment | 27,082 | 25,018 |
Loans acquired with deteriorated credit quality |  | 6,685 |
Loans | 3,099,172 | 3,068,625 |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 21,029 |  |
Consumer Real Estate | Financial Asset Acquired with Credit Deterioration |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Individually Evaluated for Impairment |  | 0 |
Construction and Land Development |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 12,662 | 11,128 | 8,962
Charged-off loans | 0 | (18) | (74)
Recovery of previously charged-off loans | 147 | 682 | 1,863
Provision for credit losses | 32,743 | 870 | 377
Ending Balance | 42,408 | 12,662 | 11,128
Collectively Evaluated for Impairment |  | 12,629 |
Individually Evaluated for Impairment |  | 33 |
Ending Balance | 42,408 | 12,662 | 11,128
Collectively Evaluated for Impairment |  | 2,426,901 |
Individually Evaluated for Impairment | 2,049 | 561 |
Loans acquired with deteriorated credit quality |  | 3,021 |
Loans | 2,901,746 | 2,430,483 |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | (3,144) |  |
Nonaccrual loans | 1,953 | 2,278 |
Construction and Land Development | Financial Asset Acquired with Credit Deterioration |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Individually Evaluated for Impairment |  | 0 |
Commercial and Industrial |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 36,112 | 31,731 | 24,863
Charged-off loans | (38,718) | (19,208) | (13,175)
Recovery of previously charged-off loans | 4,540 | 6,473 | 3,035
Provision for credit losses | 73,449 | 17,116 | 17,008
Ending Balance | 98,423 | 36,112 | 31,731
Collectively Evaluated for Impairment |  | 35,401 |
Individually Evaluated for Impairment |  | 711 |
Ending Balance | 98,423 | 36,112 | 31,731
Collectively Evaluated for Impairment |  | 6,274,280 |
Individually Evaluated for Impairment | 22,476 | 14,295 |
Loans acquired with deteriorated credit quality |  | 1,721 |
Loans | 8,038,457 | 6,290,296 |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 23,040 |  |
Commercial and Industrial | Financial Asset Acquired with Credit Deterioration |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Individually Evaluated for Impairment |  | 0 |
Consumer and Other |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 3,595 | 5,423 | 5,874
Charged-off loans | (3,993) | (6,206) | (12,528)
Recovery of previously charged-off loans | 1,554 | 1,172 | 2,711
Provision for credit losses | 4,691 | 3,206 | 9,366
Ending Balance | 8,485 | 3,595 | 5,423
Collectively Evaluated for Impairment |  | 3,586 |
Individually Evaluated for Impairment |  | 9 |
Ending Balance | 8,485 | 3,595 | 5,423
Collectively Evaluated for Impairment |  | 289,106 |
Individually Evaluated for Impairment | 4 | 148 |
Loans acquired with deteriorated credit quality |  | 0 |
Loans | 379,515 | 289,254 |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 2,638 |  |
Nonaccrual loans | 4 | 148 |
Consumer and Other | Financial Asset Acquired with Credit Deterioration |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Individually Evaluated for Impairment |  | 0 |
Unallocated Financing Receivables |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 985 | 677 | 1,322
Charged-off loans | 0 | 0 | 0
Recovery of previously charged-off loans | 0 | 0 | 0
Provision for credit losses | 0 | 308 | (645)
Ending Balance | 0 | 985 | 677
Ending Balance | 0 | $ 985 | $ 677
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | $ (985) |  |

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