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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, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded $ 41,433   $ 44,759
Recorded Investment, With no specific allowance recorded 36,054   38,713
Unpaid Principal Balance, With a specific allowance recorded 2,094   2,094
Recorded Investment, With a specific allowance recorded 2,084   2,094
Related Allowance, With a specific allowance recorded 175   136
Total impaired loans, Unpaid principal balance 43,527   46,853
Total impaired loans, Recorded investment 38,138   40,807
Total impaired loans, Related Allowance 175   136
Average recorded investment, with no related specific allowance 37,385 $ 39,135  
Interest income recognized, With no related specific allowance 55 85  
Average recorded investment, With a specific allowance recorded 2,089 5,941  
Total impaired loans, Average recorded investment 39,474 45,076  
Total impaired loans, Interest income recognized 55 85  
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 23,605   23,055
Recorded Investment, With no specific allowance recorded 20,990   20,704
Average recorded investment, with no related specific allowance 20,847 18,470  
Interest income recognized, With no related specific allowance 39 55  
Average recorded investment, With a specific allowance recorded   2,196  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 593   602
Recorded Investment, With no specific allowance recorded 351   364
Average recorded investment, with no related specific allowance 358 390  
Interest income recognized, With no related specific allowance   1  
Average recorded investment, With a specific allowance recorded   27  
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 6,518   6,635
Recorded Investment, With no specific allowance recorded 5,569   5,708
Average recorded investment, with no related specific allowance 5,639 5,811  
Interest income recognized, With no related specific allowance 6 6  
Average recorded investment, With a specific allowance recorded   352  
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 138   469
Recorded Investment, With no specific allowance recorded 120   469
Average recorded investment, with no related specific allowance 295 393  
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 8,719   9,597
Recorded Investment, With no specific allowance recorded 7,349   8,055
Unpaid Principal Balance, With a specific allowance recorded 2,094   2,094
Recorded Investment, With a specific allowance recorded 2,084   2,094
Related Allowance, With a specific allowance recorded 175   136
Average recorded investment, with no related specific allowance 7,702 5,501  
Interest income recognized, With no related specific allowance 9 20  
Average recorded investment, With a specific allowance recorded 2,089 3,270  
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 1,860   4,401
Recorded Investment, With no specific allowance recorded 1,675   $ 3,413
Average recorded investment, with no related specific allowance 2,544 8,570  
Interest income recognized, With no related specific allowance $ 1 3  
Average recorded investment, With a specific allowance recorded   $ 96