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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded $ 50,951 $ 49,794  
Recorded Investment, With no specific allowance recorded 41,415 39,488  
Total impaired loans, Unpaid principal balance 50,951 49,794  
Total impaired loans, Recorded investment 41,415 39,488  
Average recorded investment, with no related specific allowance 37,213 38,413 $ 38,854
Interest income recognized, With no related specific allowance 402 214 260
Average recorded investment, With a specific allowance recorded   1,669 3,740
Total impaired loans, Average recorded investment 37,213 40,082 42,594
Total impaired loans, Interest income recognized 402 214 260
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 21,084 25,492  
Recorded Investment, With no specific allowance recorded 16,057 20,065  
Average recorded investment, with no related specific allowance 17,873 20,971 19,651
Interest income recognized, With no related specific allowance 247 155 168
Average recorded investment, With a specific allowance recorded     878
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 316 869  
Recorded Investment, With no specific allowance recorded 159 565  
Average recorded investment, with no related specific allowance 406 420 377
Interest income recognized, With no related specific allowance 5 3 2
Average recorded investment, With a specific allowance recorded     11
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 6,970 6,985  
Recorded Investment, With no specific allowance recorded 5,374 5,440  
Average recorded investment, with no related specific allowance 5,298 5,561 5,806
Interest income recognized, With no related specific allowance 37 13 22
Average recorded investment, With a specific allowance recorded     141
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 74  
Recorded Investment, With no specific allowance recorded 112 73  
Average recorded investment, with no related specific allowance 79 176 571
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 18,367 9,846  
Recorded Investment, With no specific allowance recorded 16,601 8,089  
Average recorded investment, with no related specific allowance 9,324 7,207 7,193
Interest income recognized, With no related specific allowance 99 32 61
Average recorded investment, With a specific allowance recorded   1,669 2,672
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 4,102 6,528  
Recorded Investment, With no specific allowance recorded 3,112 5,256  
Average recorded investment, with no related specific allowance 4,233 4,077 5,256
Interest income recognized, With no related specific allowance $ 12 $ 11 7
Average recorded investment, With a specific allowance recorded     $ 38