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Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 12,195,873	$ 12,900,897
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	348,423	391,224
Consumer | Credit cards
Loans and Leases Receivable Disclosure [Line Items]
Total loans	175,458	188,845
Consumer | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	172,965	202,379
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans	8,819,907	9,223,791
Real Estate | Construction and development
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,451,841	1,596,255
Real Estate | Single family residential
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,730,056	1,880,673
Real Estate | Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	5,638,010	5,746,863
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	2,600,621	2,750,291
Commercial | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	2,444,700	2,574,386
Commercial | Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Total loans	155,921	175,905
Other
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 426,922	$ 535,591

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
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-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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