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Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 14,606,900 | $ 14,425,704
Consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 398,372 | 453,997
Consumer | Credit cards |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 184,348 | 204,802
Consumer | Other consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 214,024 | 249,195
Real Estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 10,533,787 | 11,021,940
Real Estate | Construction and development |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,010,256 | 2,248,673
Real Estate | Single family residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,207,087 | 2,414,753
Real Estate | Other commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 6,316,444 | 6,358,514
Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 3,255,931 | 2,642,644
Commercial | Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 3,038,216 | 2,451,119
Commercial | Agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 217,715 | 191,525
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 418,810 | $ 307,123

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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