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Loans Held for Investment and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans | $ 7,656,645,000 | $ 6,943,563,000 |
Gains (losses) on sale of property held in other real estate owned | 728,000 | 4,200,000 | $ 618,000
Write down of property held in other real estate owned | 5,200,000 | 3,700,000 | 538,000
Balance of modifies loans | 5,300,000 |  |
Interest income recognized on nonaccrual loans | 0 | 0 | 0
Nonaccrual loans with no related allowance for credit losses | 0 | 0 |
Interest income that would have been recognized | 1,600,000 | 1,300,000 | 2,200,000
Provision for/(benefit from) credit losses | 7,458,000 | 10,076,000 | $ (8,690,000)
Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Other real estate | 29,400,000 | 29,400,000 |
U.S. Federal Agencies [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Nonaccrual loans guaranteed by government agencies | $ 6,700,000 | $ 4,700,000 |
BancFirst [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Loan percentage | 84.00% |  |
Pegasus and Worthington [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Loan percentage | 16.00% |  |
Parent Company [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Percentage of loans secured by real estate | 69.00% |  |

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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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
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- Definition Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 + 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 -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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