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Loans and Allowance for Credit Losses - Summary of Amortized Cost Balance of Financial Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | $ 19,883,573 |  | $ 17,170,871 |  |  |
Related Allowance for Credit Losses | 187,432 | $ 166,605 | 196,711 | $ 196,272 | $ 203,399 | $ 218,583
Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 22,570 |  | 92,032 |  |  |
Related Allowance for Credit Losses | 811 |  | 2,421 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 19,375 |  | 85,680 |  |  |
Commercial and Industrial Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 8,789,114 |  | 7,258,120 |  |  |
Related Allowance for Credit Losses | 133,105 | 112,942 | 123,732 | 105,135 | 118,121 | 122,700
Commercial and Industrial Portfolio [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 14,319 |  | 82,845 |  |  |
Related Allowance for Credit Losses | 794 |  | 2,421 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 11,791 |  | 76,493 |  |  |
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 8,602,443 |  | 7,085,191 |  |  |
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 14,319 |  | 82,845 |  |  |
Related Allowance for Credit Losses | 794 |  | 2,421 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 11,791 |  | 76,493 |  |  |
Commercial and Industrial Portfolio [Member] | Agriculture [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 182,126 |  | 154,342 |  |  |
Specialty Lending Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 548,123 |  | 522,362 |  |  |
Related Allowance for Credit Losses |  | 1,133 | 1,738 | 6,720 | 5,901 | 5,219
Specialty Lending Portfolio [Member] | Asset-based Lending [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 548,123 |  | 415,207 |  |  |
Specialty Lending Portfolio [Member] | Factoring [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets |  |  | 107,155 |  |  |
Commercial Real Estate Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 7,104,217 |  | 6,267,544 |  |  |
Related Allowance for Credit Losses | 38,149 | 37,240 | 56,265 | 67,533 | 56,734 | 61,931
Commercial Real Estate Portfolio Segment | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,772 |  | 4,877 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 2,772 |  | 4,877 |  |  |
Commercial Real Estate Portfolio Segment | Owner-occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,122,657 |  | 1,866,538 |  |  |
Commercial Real Estate Portfolio Segment | Owner-occupied [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,261 |  | 2,764 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 2,261 |  | 2,764 |  |  |
Commercial Real Estate Portfolio Segment | Non-owner-occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 3,053,949 |  | 2,906,179 |  |  |
Commercial Real Estate Portfolio Segment | Farmland [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 516,592 |  | 480,268 |  |  |
Commercial Real Estate Portfolio Segment | Farmland [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 409 |  | 487 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 409 |  | 487 |  |  |
Commercial Real Estate Portfolio Segment | 5+ Multi-family [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 165,417 |  | 205,312 |  |  |
Commercial Real Estate Portfolio Segment | 1-4 Family Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 79,860 |  | 76,255 |  |  |
Commercial Real Estate Portfolio Segment | General Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 1,165,742 |  | 732,992 |  |  |
Commercial Real Estate Portfolio Segment | General Construction [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 102 |  | 1,626 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 102 |  | 1,626 |  |  |
Consumer Real Estate Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,634,518 |  | 2,320,033 |  |  |
Related Allowance for Credit Losses | 4,998 | 4,565 | 3,921 | 6,183 | 5,807 | 6,586
Consumer Real Estate Portfolio [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 4,902 |  | 4,210 |  |  |
Related Allowance for Credit Losses | 17 |  |  |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 4,235 |  | 4,210 |  |  |
Consumer Real Estate Portfolio [Member] | HELOC [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 337,647 |  | 331,638 |  |  |
Consumer Real Estate Portfolio [Member] | HELOC [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,550 |  | 2,488 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 2,550 |  | 2,488 |  |  |
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,269,872 |  | 1,966,335 |  |  |
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,290 |  | 1,647 |  |  |
Related Allowance for Credit Losses | 17 |  |  |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 1,623 |  | 1,647 |  |  |
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 26,999 |  | 22,060 |  |  |
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 62 |  | 75 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 62 |  | 75 |  |  |
Consumer Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 134,825 |  | 129,135 |  |  |
Related Allowance for Credit Losses | 428 | 863 | 845 | 1,014 | 857 | 1,480
Consumer Portfolio [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 553 |  | 75 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 553 |  | 75 |  |  |
Consumer Portfolio [Member] | Revolving Line [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 56,214 |  | 61,143 |  |  |
Consumer Portfolio [Member] | Revolving Line [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 488 |  |  |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 488 |  |  |  |  |
Consumer Portfolio [Member] | Auto [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 23,748 |  | 24,929 |  |  |
Consumer Portfolio [Member] | Auto [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 50 |  | 38 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 50 |  | 38 |  |  |
Consumer Portfolio [Member] | Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 54,863 |  | 43,063 |  |  |
Consumer Portfolio [Member] | Other [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 15 |  | 37 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 15 |  | 37 |  |  |
Leases and Other Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 236,796 |  | 282,288 |  |  |
Related Allowance for Credit Losses | 1,658 | $ 2,024 | 2,195 | $ 1,249 | $ 1,400 | $ 2,271
Leases and Other Portfolio [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 24 |  | 25 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 24 |  | 25 |  |  |
Leases and Other Portfolio [Member] | Leases [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 1,953 |  | 2,167 |  |  |
Leases and Other Portfolio [Member] | Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 234,843 |  | 280,121 |  |  |
Leases and Other Portfolio [Member] | Other [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 24 |  | 25 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | $ 24 |  | $ 25 |  |  |

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