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Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 11,386,352 | $ 12,900,897
Consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 359,346 | 391,224
Consumer | Credit cards |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 177,634 | 188,845
Consumer | Other consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 181,712 | 202,379
Real Estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 8,368,848 | 9,223,791
Real Estate | Construction and development |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 1,428,165 | 1,596,255
Real Estate | Single family residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 1,608,028 | 1,880,673
Real Estate | Other commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 5,332,655 | 5,746,863
Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,268,191 | 2,750,291
Commercial | Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,074,729 | 2,574,386
Commercial | Agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 193,462 | 175,905
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 389,967 | $ 535,591

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