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Allowance for Credit Losses - Schedule of Allowance for Loan Losses and Carrying Amount of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan and Lease Losses Beginning balance | $ 271,844 | $ 259,237 |
Initial allowance for PCD loans (acquired during the period) | 17,518 | 0 | $ 0
Charge-offs | (50,912) | (17,530) |
Recoveries | 5,200 | 4,985 |
Provision | 53,868 | 25,152 | 31,154
Allowance for Loan and Lease Losses Ending balance | 297,518 | 271,844 | 259,237
Construction & Land Development [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan and Lease Losses Beginning balance | 63,621 | 59,913 |
Initial allowance for PCD loans (acquired during the period) | 4,584 |  |
Charge-offs | (408) | (29) |
Recoveries | 225 | 319 |
Provision | (10,055) | 3,418 |
Allowance for Loan and Lease Losses Ending balance | 57,967 | 63,621 | 59,913
Bank Card [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan and Lease Losses Beginning balance | 891 | 810 |
Initial allowance for PCD loans (acquired during the period) | 0 |  |
Charge-offs | (320) | (431) |
Recoveries | 55 | 19 |
Provision | 263 | 493 |
Allowance for Loan and Lease Losses Ending balance | 889 | 891 | 810
Commercial Real Estate [Member] | Owner-Occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan and Lease Losses Beginning balance | 11,852 | 11,895 |
Initial allowance for PCD loans (acquired during the period) | 795 |  |
Charge-offs | (228) | (116) |
Recoveries | 318 | 1,183 |
Provision | 827 | (1,110) |
Allowance for Loan and Lease Losses Ending balance | 13,564 | 11,852 | 11,895
Commercial Real Estate [Member] | Nonowner-Occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan and Lease Losses Beginning balance | 74,522 | 57,935 |
Initial allowance for PCD loans (acquired during the period) | 11,059 |  |
Charge-offs | (35,798) | (2,581) |
Recoveries | 160 | 200 |
Provision | 46,773 | 18,968 |
Allowance for Loan and Lease Losses Ending balance | 96,716 | 74,522 | 57,935
Other Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan and Lease Losses Beginning balance | 65,105 | 75,007 |
Initial allowance for PCD loans (acquired during the period) | 872 |  |
Charge-offs | (5,424) | (3,589) |
Recoveries | 2,309 | 1,650 |
Provision | (1,133) | (7,963) |
Allowance for Loan and Lease Losses Ending balance | 61,729 | 65,105 | 75,007
Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan and Lease Losses Beginning balance | 46,373 | 41,167 |
Initial allowance for PCD loans (acquired during the period) | 208 |  |
Charge-offs | (999) | (481) |
Recoveries | 704 | 495 |
Provision | 7,663 | 5,192 |
Allowance for Loan and Lease Losses Ending balance | 53,949 | 46,373 | 41,167
Other Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan and Lease Losses Beginning balance | 9,480 | 12,510 |
Initial allowance for PCD loans (acquired during the period) | 0 |  |
Charge-offs | (7,735) | (10,303) |
Recoveries | 1,429 | 1,119 |
Provision | 9,530 | 6,154 |
Allowance for Loan and Lease Losses Ending balance | $ 12,704 | $ 9,480 | $ 12,510

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- Definition Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-3 + Details
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