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Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - Nonperforming Loans [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded $ 42,460   $ 35,493
Recorded Investment, With no specific allowance recorded 32,919   26,808
Total impaired loans, Unpaid principal balance 42,460   35,493
Total impaired loans, Recorded investment     26,808
Average recorded investment, with no related specific allowance 29,864 $ 40,317  
Total impaired loans, Average recorded investment 29,864 40,317  
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 16,367   15,128
Recorded Investment, With no specific allowance recorded 11,679   10,582
Average recorded investment, with no related specific allowance 11,131 14,447  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 119   104
Recorded Investment, With no specific allowance recorded 73   51
Average recorded investment, with no related specific allowance 62 134  
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 6,420   6,521
Recorded Investment, With no specific allowance recorded 4,669   4,777
Average recorded investment, with no related specific allowance 4,723 5,118  
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 1,023    
Recorded Investment, With no specific allowance recorded 210    
Average recorded investment, with no related specific allowance 105 56  
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 14,871   11,248
Recorded Investment, With no specific allowance recorded 13,523   9,557
Average recorded investment, with no related specific allowance 11,540 17,401  
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 3,660   2,492
Recorded Investment, With no specific allowance recorded 2,765   $ 1,841
Average recorded investment, with no related specific allowance $ 2,303 $ 3,161