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Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - Nonperforming Loans [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded $ 35,493 $ 50,951  
Recorded Investment, With no specific allowance recorded 26,808 41,415  
Total impaired loans, Unpaid principal balance 35,493 50,951  
Total impaired loans, Recorded investment 26,808 41,415  
Average recorded investment, with no related specific allowance 33,775 37,213 $ 38,413
Interest income recognized, With no related specific allowance   402 214
Average recorded investment, With a specific allowance recorded     1,669
Total impaired loans, Average recorded investment 33,775 37,213 40,082
Total impaired loans, Interest income recognized   402 214
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 15,128 21,084  
Recorded Investment, With no specific allowance recorded 10,582 16,057  
Average recorded investment, with no related specific allowance 12,628 17,873 20,971
Interest income recognized, With no related specific allowance   247 155
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 104 316  
Recorded Investment, With no specific allowance recorded 51 159  
Average recorded investment, with no related specific allowance 107 406 420
Interest income recognized, With no related specific allowance   5 3
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 6,521 6,970  
Recorded Investment, With no specific allowance recorded 4,777 5,374  
Average recorded investment, with no related specific allowance 5,119 5,298 5,561
Interest income recognized, With no related specific allowance   37 13
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded   112  
Recorded Investment, With no specific allowance recorded   112  
Average recorded investment, with no related specific allowance 22 79 176
Interest income recognized, With no related specific allowance   2  
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 11,248 18,367  
Recorded Investment, With no specific allowance recorded 9,557 16,601  
Average recorded investment, with no related specific allowance 13,369 9,324 7,207
Interest income recognized, With no related specific allowance   99 32
Average recorded investment, With a specific allowance recorded     1,669
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 2,492 4,102  
Recorded Investment, With no specific allowance recorded 1,841 3,112  
Average recorded investment, with no related specific allowance $ 2,530 4,233 4,077
Interest income recognized, With no related specific allowance   $ 12 $ 11