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Loans - Activity in the Allowance for Credit Losses on Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning Balance |  |  | $ 270,151 |
Ending Balance | $ 277,803 |  | 277,803 |
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning Balance | 94,307 | $ 75,596 | 87,569 | $ 74,006
Credit loss expense (benefit) | 4,315 | 6,936 | 14,496 | 8,928
Charge-offs | (4,163) | (4,282) | (8,499) | (6,426)
Recoveries | 1,025 | 304 | 1,918 | 2,046
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (3,138) | (3,978) | (6,581) | (4,380)
Ending Balance | 95,484 | 78,554 | 95,484 | 78,554
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning Balance | 10,256 | 14,218 | 9,992 | 17,814
Credit loss expense (benefit) | (47) | (3,038) | (85) | (6,814)
Charge-offs | 0 | (79) | (52) | (79)
Recoveries | 180 | 384 | 534 | 564
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | 180 | 305 | 482 | 485
Ending Balance | 10,389 | 11,485 | 10,389 | 11,485
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning Balance | 143,177 | 138,224 | 143,205 | 130,598
Credit loss expense (benefit) | 383 | 1,903 | 2,353 | 9,513
Charge-offs | (2,639) | (122) | (4,639) | (122)
Recoveries | 2 | 15 | 4 | 31
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (2,637) | (107) | (4,635) | (91)
Ending Balance | 140,923 | 140,020 | 140,923 | 140,020
Total consumer real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning Balance | 18,924 | 13,857 | 19,106 | 13,538
Credit loss expense (benefit) | 3,821 | 2,175 | 4,250 | 3,981
Charge-offs | (1,292) | (408) | (2,250) | (2,077)
Recoveries | 254 | 83 | 601 | 265
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (1,038) | (325) | (1,649) | (1,812)
Ending Balance | 21,707 | 15,707 | 21,707 | 15,707
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning Balance | 8,824 | 8,402 | 10,279 | 10,040
Credit loss expense (benefit) | 4,994 | 7,760 | 7,480 | 11,778
Charge-offs | (7,290) | (8,360) | (14,134) | (16,617)
Recoveries | 2,772 | 2,739 | 5,675 | 5,340
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (4,518) | (5,621) | (8,459) | (11,277)
Ending Balance | 9,300 | 10,541 | 9,300 | 10,541
Loans Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning Balance | 275,488 | 250,297 | 270,151 | 245,996
Credit loss expense (benefit) | 13,466 | 15,736 | 28,494 | 27,386
Charge-offs | (15,384) | (13,251) | (29,574) | (25,321)
Recoveries | 4,233 | 3,525 | 8,732 | 8,246
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net | (11,151) | (9,726) | (20,842) | (17,075)
Ending Balance | $ 277,803 | $ 256,307 | $ 277,803 | $ 256,307

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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 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. 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 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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