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Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Financing Receivable, Impaired [Line Items]      
Total impaired loans, Recorded investment $ 81,489   $ 39,752
Nonperforming Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 85,547   46,009
Recorded Investment, With no specific allowance recorded 71,412   36,634
Unpaid Principal Balance, With a specific allowance recorded 10,077   3,118
Recorded Investment, With a specific allowance recorded 10,077   3,118
Related Allowance, With a specific allowance recorded 8,121   516
Total impaired loans, Unpaid principal balance 95,624   49,127
Total impaired loans, Recorded investment 81,489   39,752
Total impaired loans, Related Allowance 8,121   516
Average recorded investment, with no related specific allowance 54,024 $ 29,864  
Average recorded investment, With a specific allowance recorded 6,598    
Total impaired loans, Average recorded investment 60,622 29,864  
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Total impaired loans, Recorded investment 27,183   19,036
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Total impaired loans, Recorded investment 26,002   12,524
Residential Real Estate [Member] | Nonperforming Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 32,857   17,200
Recorded Investment, With no specific allowance recorded 26,002   12,524
Average recorded investment, with no related specific allowance 19,263 11,131  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Total impaired loans, Recorded investment 3,345   87
Consumer [Member] | Nonperforming Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 3,935   140
Recorded Investment, With no specific allowance recorded 3,345   87
Average recorded investment, with no related specific allowance 1,716 62  
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Total impaired loans, Recorded investment 7,756   6,208
Home Equity [Member] | Nonperforming Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 10,408   8,284
Recorded Investment, With no specific allowance recorded 7,756   6,208
Average recorded investment, with no related specific allowance 6,982 4,723  
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Nonperforming Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Average recorded investment, with no related specific allowance   105  
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Total impaired loans, Recorded investment 27,183   19,036
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Nonperforming Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 27,029   17,489
Recorded Investment, With no specific allowance recorded 24,065   15,918
Unpaid Principal Balance, With a specific allowance recorded 3,118   3,118
Recorded Investment, With a specific allowance recorded 3,118   3,118
Related Allowance, With a specific allowance recorded 2,107   516
Average recorded investment, with no related specific allowance 19,992 11,540  
Average recorded investment, With a specific allowance recorded 3,118    
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Total impaired loans, Recorded investment 17,203   1,897
Commercial and Industrial [Member] | Nonperforming Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 11,318   2,896
Recorded Investment, With no specific allowance recorded 10,244   $ 1,897
Unpaid Principal Balance, With a specific allowance recorded 6,959    
Recorded Investment, With a specific allowance recorded 6,959    
Related Allowance, With a specific allowance recorded 6,014    
Average recorded investment, with no related specific allowance 6,071 $ 2,303  
Average recorded investment, With a specific allowance recorded $ 3,480