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Loans and Allowance for Credit Losses - Summary of Amortized Cost Balance of Financial Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | $ 18,972,158 |  | $ 17,170,871 |  |  |
Related Allowance for Credit Losses | 166,605 | $ 181,333 | 196,711 | $ 203,399 | $ 205,773 | $ 218,583
Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 22,216 |  | 92,032 |  |  |
Related Allowance for Credit Losses | 340 |  | 2,421 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 21,660 |  | 85,680 |  |  |
Commercial and Industrial Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 8,308,854 |  | 7,258,120 |  |  |
Related Allowance for Credit Losses | 112,942 | 118,668 | 123,732 | 118,121 | 119,568 | 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 | 14,412 |  | 82,845 |  |  |
Related Allowance for Credit Losses | 340 |  | 2,421 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 13,856 |  | 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 | 8,099,941 |  | 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 | 14,412 |  | 82,845 |  |  |
Related Allowance for Credit Losses | 340 |  | 2,421 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 13,856 |  | 76,493 |  |  |
Commercial and Industrial Portfolio [Member] | Agriculture [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 170,677 |  | 154,342 |  |  |
Specialty Lending Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 545,837 |  | 522,362 |  |  |
Related Allowance for Credit Losses | 1,133 | 861 | 1,738 | 5,901 | 4,673 | 5,219
Specialty Lending Portfolio [Member] | Asset-based Lending [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 545,837 |  | 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 | 6,725,833 |  | 6,267,544 |  |  |
Related Allowance for Credit Losses | 37,240 | 47,310 | 56,265 | 56,734 | 60,043 | 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 | 2,781 |  | 4,877 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 2,781 |  | 4,877 |  |  |
Commercial Real Estate Portfolio Segment | Owner-occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,138,815 |  | 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 | 2,258 |  | 2,764 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 2,258 |  | 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 | 2,890,867 |  | 2,906,179 |  |  |
Commercial Real Estate Portfolio Segment | Farmland [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 484,132 |  | 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 | 420 |  | 487 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 420 |  | 487 |  |  |
Commercial Real Estate Portfolio Segment | 5+ Multi-family [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 186,503 |  | 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 | 72,577 |  | 76,255 |  |  |
Commercial Real Estate Portfolio Segment | General Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 952,939 |  | 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 | 103 |  | 1,626 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 103 |  | 1,626 |  |  |
Consumer Real Estate Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,528,892 |  | 2,320,033 |  |  |
Related Allowance for Credit Losses | 4,565 | 4,037 | 3,921 | 5,807 | 4,183 | 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 | 4,437 |  | 4,210 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 4,437 |  | 4,210 |  |  |
Consumer Real Estate Portfolio [Member] | HELOC [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 319,802 |  | 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 | 2,346 |  | 2,488 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 2,346 |  | 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 | 2,184,056 |  | 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 | 2,027 |  | 1,647 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 2,027 |  | 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 | 25,034 |  | 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 | 64 |  | 75 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 64 |  | 75 |  |  |
Consumer Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 172,591 |  | 129,135 |  |  |
Related Allowance for Credit Losses | 863 | 418 | 845 | 857 | 603 | 1,480
Consumer Portfolio [Member] | Collateral Dependent Assets [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 561 |  | 75 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 561 |  | 75 |  |  |
Consumer Portfolio [Member] | Revolving Line [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 60,548 |  | 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 | 491 |  |  |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 491 |  |  |  |  |
Consumer Portfolio [Member] | Auto [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 24,380 |  | 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 | 55 |  | 38 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 55 |  | 38 |  |  |
Consumer Portfolio [Member] | Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 87,663 |  | 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 | 292,859 |  | 282,288 |  |  |
Related Allowance for Credit Losses | 2,024 | $ 2,175 | 2,195 | $ 1,400 | $ 1,600 | $ 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 | 25 |  | 25 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | 25 |  | 25 |  |  |
Leases and Other Portfolio [Member] | Leases [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 2,120 |  | 2,167 |  |  |
Leases and Other Portfolio [Member] | Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized Cost of Collateral Dependent Assets | 290,739 |  | 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 | 25 |  | 25 |  |  |
Amortized Cost of Collateral Dependent Assets with no related Allowance | $ 25 |  | $ 25 |  |  |

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