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Loans and Allowance for Credit Losses - Summary of Amortized Cost Balance of Financial Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 37,706,507   $ 25,642,301      
Related Allowance for Credit Losses 406,816 $ 394,193 261,734 $ 251,669 $ 242,123 $ 222,996
Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 129,076   19,037      
Related Allowance for Credit Losses 27,582          
Amortized Cost of Collateral Dependent Assets with no related Allowance 59,564   19,037      
Commercial and Industrial Portfolio [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 15,198,082   10,993,771      
Related Allowance for Credit Losses 223,268 210,728 161,553 158,162 151,448 157,389
Commercial and Industrial Portfolio [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 33,610   4,423      
Related Allowance for Credit Losses 15,670          
Amortized Cost of Collateral Dependent Assets with no related Allowance 14,793   4,423      
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 12,660,013   9,122,691      
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 31,315   4,423      
Related Allowance for Credit Losses 15,670          
Amortized Cost of Collateral Dependent Assets with no related Allowance 12,498   4,423      
Commercial and Industrial Portfolio [Member] | Agriculture [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 373,519   178,368      
Commercial and Industrial Portfolio [Member] | Agriculture [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 1,054          
Amortized Cost of Collateral Dependent Assets with no related Allowance 1,054          
Commercial and Industrial Portfolio [Member] | NDFIs [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 2,135,339   1,681,485      
Commercial and Industrial Portfolio [Member] | NDFIs [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 1,241          
Amortized Cost of Collateral Dependent Assets with no related Allowance 1,241          
Specialty Lending Portfolio [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 561,394   469,194      
Specialty Lending Portfolio [Member] | Asset-based Lending [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 561,394   469,194      
Commercial Real Estate Portfolio [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 16,583,095   10,131,285      
Related Allowance for Credit Losses 155,693 153,489 77,340 72,100 68,862 45,507
Commercial Real Estate Portfolio [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 70,005   960      
Related Allowance for Credit Losses 11,912          
Amortized Cost of Collateral Dependent Assets with no related Allowance 19,310   960      
Commercial Real Estate Portfolio [Member] | Owner-occupied [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 4,746,565   2,265,071      
Commercial Real Estate Portfolio [Member] | Owner-occupied [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 8,300   707      
Related Allowance for Credit Losses 2,335          
Amortized Cost of Collateral Dependent Assets with no related Allowance 1,558   707      
Commercial Real Estate Portfolio [Member] | Non-owner-occupied [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 5,979,256   3,807,854      
Commercial Real Estate Portfolio [Member] | Non-owner-occupied [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 52,876          
Related Allowance for Credit Losses 9,423          
Amortized Cost of Collateral Dependent Assets with no related Allowance 9,342          
Commercial Real Estate Portfolio [Member] | Farmland [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 845,828   510,543      
Commercial Real Estate Portfolio [Member] | Farmland [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 1,740   135      
Amortized Cost of Collateral Dependent Assets with no related Allowance 1,740   135      
Commercial Real Estate Portfolio [Member] | 5+ Multi-family [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 1,611,687   823,913      
Commercial Real Estate Portfolio [Member] | 1-4 Family Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 99,114   47,486      
Commercial Real Estate Portfolio [Member] | General Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 3,300,645   2,676,418      
Commercial Real Estate Portfolio [Member] | General Construction [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 7,089   118      
Related Allowance for Credit Losses 154          
Amortized Cost of Collateral Dependent Assets with no related Allowance 6,670   118      
Consumer Real Estate Portfolio [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 4,342,559   3,187,130      
Related Allowance for Credit Losses 6,089 5,521 4,327 3,744 3,567 6,941
Consumer Real Estate Portfolio [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 24,633   13,614      
Amortized Cost of Collateral Dependent Assets with no related Allowance 24,633   13,614      
Consumer Real Estate Portfolio [Member] | HELOC [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 712,428   399,721      
Consumer Real Estate Portfolio [Member] | HELOC [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 4,806   2,211      
Amortized Cost of Collateral Dependent Assets with no related Allowance 4,806   2,211      
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 3,495,831   2,745,257      
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 19,025   11,240      
Amortized Cost of Collateral Dependent Assets with no related Allowance 19,025   11,240      
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 134,300   42,152      
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 802   163      
Amortized Cost of Collateral Dependent Assets with no related Allowance 802   163      
Consumer Portfolio [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 223,453   193,860      
Related Allowance for Credit Losses 1,159 1,567 966 503 632 1,089
Consumer Portfolio [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 828   40      
Amortized Cost of Collateral Dependent Assets with no related Allowance 828   40      
Consumer Portfolio [Member] | Revolving Line [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 154,622   101,442      
Consumer Portfolio [Member] | Revolving Line [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 645          
Amortized Cost of Collateral Dependent Assets with no related Allowance 645          
Consumer Portfolio [Member] | Auto [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 35,488   22,414      
Consumer Portfolio [Member] | Auto [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 87   19      
Amortized Cost of Collateral Dependent Assets with no related Allowance 87   19      
Consumer Portfolio [Member] | Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 33,343   70,004      
Consumer Portfolio [Member] | Other [Member] | Collateral Dependent Assets [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 96   21      
Amortized Cost of Collateral Dependent Assets with no related Allowance 96   21      
Leases and Other Portfolio [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 108,117   88,295      
Related Allowance for Credit Losses 698 $ 700 631 $ 710 $ 722 $ 877
Leases and Other Portfolio [Member] | Leases [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans 1,276   1,492      
Leases and Other Portfolio [Member] | Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 106,841   $ 86,803