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Loans and Allowance for Credit Losses - Summary of Amortized Cost Balance of Financial Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | $ 40,134,325 | $ 38,779,408 |  |
Related Allowance for Credit Losses | 429,233 | 421,162 | $ 373,488 | $ 261,734
Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 150,800 | 144,301 |  |
Related Allowance for Credit Losses | 30,844 | 23,127 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 76,428 | 76,424 |  |
Commercial and Industrial Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 17,068,764 | 16,270,520 |  |
Related Allowance for Credit Losses | 252,669 | 240,324 | 192,755 | 161,553
Commercial and Industrial Portfolio [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 55,975 | 26,633 |  |
Related Allowance for Credit Losses | 19,879 | 11,428 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 12,640 | 10,870 |  |
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 13,930,909 | 13,301,203 |  |
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 53,449 | 23,594 |  |
Related Allowance for Credit Losses | 18,535 | 10,741 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 11,458 | 9,274 |  |
Commercial and Industrial Portfolio [Member] | Agriculture [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 490,650 | 521,803 |  |
Commercial and Industrial Portfolio [Member] | Agriculture [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 1,681 | 2,186 |  |
Related Allowance for Credit Losses | 500 | 687 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 1,181 | 743 |  |
Commercial and Industrial Portfolio [Member] | NDFIs [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 2,636,062 | 2,430,137 |  |
Commercial and Industrial Portfolio [Member] | NDFIs [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 845 | 853 |  |
Related Allowance for Credit Losses | 844 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 1 | 853 |  |
Specialty Lending Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 646,027 | 518,237 |  |
Specialty Lending Portfolio [Member] | Asset-based Lending [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 646,027 | 518,237 |  |
Commercial Real Estate Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 16,627,070 | 16,376,239 |  |
Related Allowance for Credit Losses | 146,435 | 151,060 | 149,345 | 77,340
Commercial Real Estate Portfolio [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 63,575 | 86,981 |  |
Related Allowance for Credit Losses | 10,913 | 11,494 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 33,547 | 36,116 |  |
Commercial Real Estate Portfolio [Member] | Owner-occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 4,932,315 | 4,775,057 |  |
Commercial Real Estate Portfolio [Member] | Owner-occupied [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 16,496 | 10,905 |  |
Related Allowance for Credit Losses | 6,427 | 2,240 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 10,069 | 3,746 |  |
Commercial Real Estate Portfolio [Member] | Non-owner-occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 5,838,083 | 5,734,870 |  |
Commercial Real Estate Portfolio [Member] | Non-owner-occupied [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 28,907 | 50,955 |  |
Related Allowance for Credit Losses | 4,486 | 9,093 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 5,306 | 8,957 |  |
Commercial Real Estate Portfolio [Member] | Farmland [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 851,058 | 863,570 |  |
Commercial Real Estate Portfolio [Member] | Farmland [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 3,655 | 3,389 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 3,655 | 3,389 |  |
Commercial Real Estate Portfolio [Member] | 5+ Multi-family [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 1,788,547 | 1,776,655 |  |
Commercial Real Estate Portfolio [Member] | 5+ Multi-family [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 14,324 | 14,324 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 14,324 | 14,324 |  |
Commercial Real Estate Portfolio [Member] | 1-4 Family Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 87,613 | 89,474 |  |
Commercial Real Estate Portfolio [Member] | General Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 3,129,454 | 3,136,613 |  |
Commercial Real Estate Portfolio [Member] | General Construction [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 193 | 7,408 |  |
Related Allowance for Credit Losses |  | 161 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 193 | 5,700 |  |
Consumer Real Estate Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 4,429,728 | 4,436,468 |  |
Related Allowance for Credit Losses | 5,134 | 6,938 | 4,798 | 4,327
Consumer Real Estate Portfolio [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 31,103 | 29,910 |  |
Related Allowance for Credit Losses | 52 | 205 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 30,094 | 28,661 |  |
Consumer Real Estate Portfolio [Member] | HELOC [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 719,226 | 718,173 |  |
Consumer Real Estate Portfolio [Member] | HELOC [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 5,421 | 5,319 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 5,421 | 5,319 |  |
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 3,585,707 | 3,590,647 |  |
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 24,827 | 23,969 |  |
Related Allowance for Credit Losses | 52 | 205 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 23,818 | 22,720 |  |
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 124,795 | 127,648 |  |
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 855 | 622 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 855 | 622 |  |
Consumer Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 235,982 | 238,811 |  |
Related Allowance for Credit Losses | 1,319 | 1,387 | 1,488 | 966
Consumer Portfolio [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 147 | 777 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 147 | 777 |  |
Consumer Portfolio [Member] | Revolving Line [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 152,044 | 162,697 |  |
Consumer Portfolio [Member] | Revolving Line [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 34 | 633 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 34 | 633 |  |
Consumer Portfolio [Member] | Auto [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 29,393 | 31,887 |  |
Consumer Portfolio [Member] | Auto [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 45 | 47 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 45 | 47 |  |
Consumer Portfolio [Member] | Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 54,545 | 44,227 |  |
Consumer Portfolio [Member] | Other [Member] | Collateral Dependent Assets [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 68 | 97 |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 68 | 97 |  |
Leases and Other Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 408,923 | 238,400 |  |
Related Allowance for Credit Losses | 1,788 | 1,727 | $ 541 | $ 631
Leases and Other Portfolio [Member] | Leases [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | 1,186 | 1,214 |  |
Leases and Other Portfolio [Member] | Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Loans | $ 407,737 | $ 237,186 |  |

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