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Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 12,028,593 | $ 12,012,503
Consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 364,974 | 355,370
Consumer | Credit cards |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 184,372 | 187,052
Consumer | Other consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 180,602 | 168,318
Real Estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 9,228,990 | 9,167,250
Real Estate | Construction and development |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 1,423,445 | 1,326,371
Real Estate | Single family residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,042,978 | 2,101,975
Real Estate | Other commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 5,762,567 | 5,738,904
Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,166,870 | 2,160,760
Commercial | Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,016,405 | 1,992,043
Commercial | Agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 150,465 | 168,717
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 267,759 | $ 329,123

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