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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

X

- Definition

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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+ References

No definition available.

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