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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded $ 44,759 $ 45,717  
Recorded Investment, With no specific allowance recorded 38,713 41,097  
Unpaid Principal Balance, With a specific allowance recorded 2,094 10,000  
Recorded Investment, With a specific allowance recorded 2,094 9,247  
Related Allowance, With a specific allowance recorded 136 124  
Total impaired loans, Unpaid principal balance 46,853 55,717  
Total impaired loans, Recorded investment 40,807 50,344  
Total impaired loans, Related Allowance 136 124  
Average recorded investment, with no related specific allowance 38,854 32,311 $ 38,781
Interest income recognized, With no related specific allowance 260 341 665
Average recorded investment, With a specific allowance recorded 3,740 7,995 842
Total impaired loans, Average recorded investment 42,594 40,306 39,623
Total impaired loans, Interest income recognized 260 341 665
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 23,055 17,753  
Recorded Investment, With no specific allowance recorded 20,704 15,952  
Unpaid Principal Balance, With a specific allowance recorded   4,772  
Recorded Investment, With a specific allowance recorded   4,392  
Related Allowance, With a specific allowance recorded   14  
Average recorded investment, with no related specific allowance 19,651 14,192 19,026
Interest income recognized, With no related specific allowance 168 211 240
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 602 546  
Recorded Investment, With no specific allowance recorded 364 413  
Unpaid Principal Balance, With a specific allowance recorded   104  
Recorded Investment, With a specific allowance recorded   53  
Related Allowance, With a specific allowance recorded   1  
Average recorded investment, with no related specific allowance 377 423 808
Interest income recognized, With no related specific allowance 2 3 7
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 6,635 6,523  
Recorded Investment, With no specific allowance recorded 5,708 5,610  
Unpaid Principal Balance, With a specific allowance recorded   724  
Recorded Investment, With a specific allowance recorded   704  
Related Allowance, With a specific allowance recorded   6  
Average recorded investment, with no related specific allowance 5,806 4,930 5,005
Interest income recognized, With no related specific allowance 22 28 25
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 469 616  
Recorded Investment, With no specific allowance recorded 469 580  
Average recorded investment, with no related specific allowance 571 343 208
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 9,597 5,097  
Recorded Investment, With no specific allowance recorded 8,055 4,229  
Unpaid Principal Balance, With a specific allowance recorded 2,094 4,207  
Recorded Investment, With a specific allowance recorded 2,094 3,907  
Related Allowance, With a specific allowance recorded 136 93  
Average recorded investment, with no related specific allowance 7,193 7,216 10,658
Interest income recognized, With no related specific allowance 61 84 381
Average recorded investment, With a specific allowance recorded 2,672 3,317 842
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 4,401 15,182  
Recorded Investment, With no specific allowance recorded 3,413 14,313  
Unpaid Principal Balance, With a specific allowance recorded   193  
Recorded Investment, With a specific allowance recorded   191  
Related Allowance, With a specific allowance recorded   10  
Average recorded investment, with no related specific allowance 5,256 5,207 3,076
Interest income recognized, With no related specific allowance 7 15 $ 12
Average recorded investment, With a specific allowance recorded $ 38 $ 175