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Loans and the Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded $ 45,717 $ 45,688  
Recorded Investment, With no specific allowance recorded 41,097 36,444  
Unpaid Principal Balance, With a specific allowance recorded 10,000    
Recorded Investment, With a specific allowance recorded 9,247    
Related Allowance, With a specific allowance recorded 124    
Total impaired loans, Unpaid principal balance 55,717 45,688  
Total impaired loans, Recorded investment 50,344 36,444  
Total impaired loans, Related Allowance 124    
Average recorded investment, with no related specific allowance 32,311 38,781 $ 38,204
Interest income recognized, With no related specific allowance 341 665 722
Average recorded investment, With a specific allowance recorded 7,995 842 4,700
Total impaired loans, Average recorded investment 40,306 39,623 42,904
Total impaired loans, Interest income recognized 341 665 722
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 17,753 20,270  
Recorded Investment, With no specific allowance recorded 15,952 18,016  
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 14,192 19,026 17,991
Interest income recognized, With no related specific allowance 211 240 252
Average recorded investment, With a specific allowance recorded 3,811    
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 546 846  
Recorded Investment, With no specific allowance recorded 413 671  
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 423 808 787
Interest income recognized, With no related specific allowance 3 7 7
Average recorded investment, With a specific allowance recorded 58    
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 6,523 5,924  
Recorded Investment, With no specific allowance recorded 5,610 5,036  
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 4,930 5,005 4,599
Interest income recognized, With no related specific allowance 28 25 19
Average recorded investment, With a specific allowance recorded 634    
Commercial Real Estate - Land and Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 616    
Recorded Investment, With no specific allowance recorded 580    
Average recorded investment, with no related specific allowance 343 208 460
Commercial Real Estate - Improved Property [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 5,097 14,038  
Recorded Investment, With no specific allowance recorded 4,229 9,293  
Unpaid Principal Balance, With a specific allowance recorded 4,207    
Recorded Investment, With a specific allowance recorded 3,907    
Related Allowance, With a specific allowance recorded 93    
Average recorded investment, with no related specific allowance 7,216 10,658 10,790
Interest income recognized, With no related specific allowance 84 381 436
Average recorded investment, With a specific allowance recorded 3,317 842 4,446
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 15,182 4,610  
Recorded Investment, With no specific allowance recorded 14,313 3,428  
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 5,207 3,076 3,577
Interest income recognized, With no related specific allowance 15 $ 12 8
Average recorded investment, With a specific allowance recorded $ 175   $ 254