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Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 12,900,897 | $ 14,425,704
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 391,224 | 454,496
Consumer | Credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 180,354 | 204,802
Consumer | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 210,870 | 249,694
Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 9,223,791 | 10,884,524
Real Estate | Construction and development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,596,255 | 2,236,861
Real Estate | Single family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,880,673 | 2,442,064
Real Estate | Other commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 5,746,863 | 6,205,599
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 2,750,291 | 2,810,970
Commercial | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 2,574,386 | 2,495,516
Commercial | Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 175,905 | 315,454
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 535,591 | $ 275,714

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