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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded $ 49,794 $ 44,759  
Recorded Investment, With no specific allowance recorded 39,488 38,713  
Unpaid Principal Balance, With a specific allowance recorded   2,094  
Recorded Investment, With a specific allowance recorded   2,094  
Related Allowance, With a specific allowance recorded   136  
Total impaired loans, Unpaid principal balance 49,794 46,853  
Total impaired loans, Recorded investment 39,488 40,807  
Total impaired loans, Related Allowance   136  
Average recorded investment, with no related specific allowance 38,413 38,854 $ 32,311
Interest income recognized, With no related specific allowance 214 260 341
Average recorded investment, With a specific allowance recorded 1,669 3,740 7,995
Total impaired loans, Average recorded investment 40,082 42,594 40,306
Total impaired loans, Interest income recognized 214 260 341
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 25,492 23,055  
Recorded Investment, With no specific allowance recorded 20,065 20,704  
Average recorded investment, with no related specific allowance 20,971 19,651 14,192
Interest income recognized, With no related specific allowance 155 168 211
Average recorded investment, With a specific allowance recorded   878 3,811
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 869 602  
Recorded Investment, With no specific allowance recorded 565 364  
Average recorded investment, with no related specific allowance 420 377 423
Interest income recognized, With no related specific allowance 3 2 3
Average recorded investment, With a specific allowance recorded   11 58
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 6,985 6,635  
Recorded Investment, With no specific allowance recorded 5,440 5,708  
Average recorded investment, with no related specific allowance 5,561 5,806 4,930
Interest income recognized, With no related specific allowance 13 22 28
Average recorded investment, With a specific allowance recorded   141 634
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 74 469  
Recorded Investment, With no specific allowance recorded 73 469  
Average recorded investment, with no related specific allowance 176 571 343
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 9,846 9,597  
Recorded Investment, With no specific allowance recorded 8,089 8,055  
Unpaid Principal Balance, With a specific allowance recorded   2,094  
Recorded Investment, With a specific allowance recorded   2,094  
Related Allowance, With a specific allowance recorded   136  
Average recorded investment, with no related specific allowance 7,207 7,193 7,216
Interest income recognized, With no related specific allowance 32 61 84
Average recorded investment, With a specific allowance recorded 1,669 2,672 3,317
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 6,528 4,401  
Recorded Investment, With no specific allowance recorded 5,256 3,413  
Average recorded investment, with no related specific allowance 4,077 5,256 5,207
Interest income recognized, With no related specific allowance $ 11 7 15
Average recorded investment, With a specific allowance recorded   $ 38 $ 175