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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded $ 45,295   $ 45,295   $ 44,759
Recorded Investment, With no specific allowance recorded 39,927   39,927   38,713
Unpaid Principal Balance, With a specific allowance recorded 2,094   2,094   2,094
Recorded Investment, With a specific allowance recorded 2,084   2,084   2,094
Related Allowance, With a specific allowance recorded 214   214   136
Total impaired loans, Unpaid principal balance 47,389   47,389   46,853
Total impaired loans, Recorded investment 42,011   42,011   40,807
Total impaired loans, Related Allowance 214   214   136
Average recorded investment, with no related specific allowance 37,992 $ 37,552 38,231 $ 38,733  
Interest income recognized, With no related specific allowance 115 67 170 152  
Average recorded investment, With a specific allowance recorded 2,084 2,632 2,087 4,838  
Total impaired loans, Average recorded investment 40,076 40,184 40,318 43,571  
Total impaired loans, Interest income recognized 115 67 170 152  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 24,888   24,888   23,055
Recorded Investment, With no specific allowance recorded 22,443   22,443   20,704
Average recorded investment, with no related specific allowance 21,717 20,541 21,379 19,011  
Interest income recognized, With no related specific allowance 101 43 140 98  
Average recorded investment, With a specific allowance recorded       1,464  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 554   554   602
Recorded Investment, With no specific allowance recorded 303   303   364
Average recorded investment, with no related specific allowance 327 380 339 391  
Interest income recognized, With no related specific allowance 1   1 1  
Average recorded investment, With a specific allowance recorded       18  
Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 6,664   6,664   6,635
Recorded Investment, With no specific allowance recorded 5,766   5,766   5,708
Average recorded investment, with no related specific allowance 5,668 6,015 5,681 5,880  
Interest income recognized, With no related specific allowance 3 6 9 12  
Average recorded investment, With a specific allowance recorded       235  
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   74   469
Recorded Investment, With no specific allowance recorded 74   74   469
Average recorded investment, with no related specific allowance 97 405 221 463  
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 8,218   8,218   9,597
Recorded Investment, With no specific allowance recorded 6,672   6,672   8,055
Unpaid Principal Balance, With a specific allowance recorded 2,094   2,094   2,094
Recorded Investment, With a specific allowance recorded 2,084   2,084   2,094
Related Allowance, With a specific allowance recorded 214   214   136
Average recorded investment, with no related specific allowance 7,011 7,349 7,359 6,309  
Interest income recognized, With no related specific allowance 8 15 17 35  
Average recorded investment, With a specific allowance recorded 2,084 2,632 2,087 3,057  
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 4,897   4,897   4,401
Recorded Investment, With no specific allowance recorded 4,669   4,669   $ 3,413
Average recorded investment, with no related specific allowance 3,172 2,862 3,252 6,679  
Interest income recognized, With no related specific allowance $ 2 $ 3 $ 3 6  
Average recorded investment, With a specific allowance recorded       $ 64