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Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Energy Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 6,191,230	$ 6,394,506
Loans held for investment (net of unearned interest)	6,191,230	6,394,506
Pegasus Bank [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	586,043	554,548
Loans held for investment (net of unearned interest)	586,043	554,548
Energy [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	404,286	430,585
Loans held for investment (net of unearned interest)	404,286	430,585
Energy [Member] | BancFirst’s [Member] | Upstream Energy Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	141,651	190,788
Loans held for investment (net of unearned interest)	141,651	190,788
Energy [Member] | BancFirst’s [Member] | Midstream Energy Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	37,134	49,734
Loans held for investment (net of unearned interest)	37,134	49,734
Energy [Member] | BancFirst’s [Member] | Ancillary Services [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	74,919	59,410
Loans held for investment (net of unearned interest)	74,919	59,410
Energy [Member] | Pegasus Bank [Member] | Upstream Energy Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	127,736	107,103
Loans held for investment (net of unearned interest)	127,736	107,103
Energy [Member] | Pegasus Bank [Member] | Midstream Energy Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	8,797	11,047
Loans held for investment (net of unearned interest)	8,797	11,047
Energy [Member] | Pegasus Bank [Member] | Ancillary Services [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	14,049	12,503
Loans held for investment (net of unearned interest)	$ 14,049	$ 12,503

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

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