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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
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