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Loans Held for Investment and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Financing Receivable Recorded Investment [Line Items] |  |  |  |  |
Paycheck protection program amortized processing fees recognized as interest income | $ 400,000 | $ 11,900,000 | $ 2,100,000 | $ 21,700,000 |
Gains (losses) on sale of property held in other real estate owned |  |  | 3,800,000 | (105,000) |
Interest income recognized on nonaccrual loans |  |  | 0 | 0 |
Nonaccrual loans with no related allowance for credit losses | 0 |  | 0 |  | $ 0
Interest income that would have been recognized |  |  | 653,000 | $ 1,200,000 |
U.S. Federal Agencies [Member] |  |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |  |
Nonaccrual loans guaranteed by government agencies |  |  | 2,200,000 |  | 3,300,000
Other Real Estate Owned [Member] | Commercial Real Estate |  |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |  |
Other real estate | $ 29,700,000 |  | $ 29,700,000 |  | 29,500,000
Previous Corporate Headquarters [Member] | Other Real Estate Owned [Member] |  |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |  |
Other real estate |  |  |  |  | $ 2,400,000
Parent Company [Member] |  |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |  |
Percentage of loans secured by real estate | 65.00% |  | 65.00% |  |
BancFirst [Member] |  |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |  |
Loan percentage |  |  | 83.00% |  |
Pegasus and Worthington [Member] |  |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |  |
Loan percentage |  |  | 17.00% |  |

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- Definition Amount of interest income on financing receivable on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
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- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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