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Loans and the Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded $ 39,890   $ 39,890   $ 45,688
Recorded Investment, With no specific allowance recorded 29,599   29,599   36,444
Unpaid Principal Balance, With a specific allowance recorded 11,591   11,591    
Recorded Investment, With a specific allowance recorded 11,042   11,042    
Related Allowance, With a specific allowance recorded 1,501   1,501    
Total impaired loans, Unpaid principal balance 51,481   51,481   45,688
Total impaired loans, Recorded investment 40,641   40,641   36,444
Total impaired loans, Related Allowance 1,501   1,501    
Average recorded investment, with no related specific allowance 28,360 $ 37,542 30,114 $ 38,225  
Interest income recognized, With no related specific allowance   99   614  
Average recorded investment, With a specific allowance recorded 11,156   7,683 1,052  
Interest income recognized, With a specific allowance recorded 99   269    
Total impaired loans, Average recorded investment 39,516 37,542 37,797 39,277  
Total impaired loans, Interest income recognized 99 99 269 614  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 15,090   15,090   20,270
Recorded Investment, With no specific allowance recorded 13,303   13,303   18,016
Unpaid Principal Balance, With a specific allowance recorded 5,096   5,096    
Recorded Investment, With a specific allowance recorded 4,662   4,662    
Related Allowance, With a specific allowance recorded 12   12    
Average recorded investment, with no related specific allowance 12,600 18,336 13,752 18,207  
Interest income recognized, With no related specific allowance   68   195  
Average recorded investment, With a specific allowance recorded 4,792   3,666    
Interest income recognized, With a specific allowance recorded 51   169    
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 442   442   846
Recorded Investment, With no specific allowance recorded 356   356   671
Unpaid Principal Balance, With a specific allowance recorded 99   99    
Recorded Investment, With a specific allowance recorded 61   61    
Related Allowance, With a specific allowance recorded 1   1    
Average recorded investment, with no related specific allowance 334 692 425 776  
Interest income recognized, With no related specific allowance   3   8  
Average recorded investment, With a specific allowance recorded 68   60    
Interest income recognized, With a specific allowance recorded 1   3    
Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 5,866   5,866   5,924
Recorded Investment, With no specific allowance recorded 5,030   5,030   5,036
Unpaid Principal Balance, With a specific allowance recorded 774   774    
Recorded Investment, With a specific allowance recorded 746   746    
Related Allowance, With a specific allowance recorded 7   7    
Average recorded investment, with no related specific allowance 4,740 4,924 4,760 4,997  
Interest income recognized, With no related specific allowance   8   19  
Average recorded investment, With a specific allowance recorded 834   616    
Interest income recognized, With a specific allowance recorded 8   23    
Commercial Real Estate - Land and Construction [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 606   606    
Recorded Investment, With no specific allowance recorded 554   554    
Average recorded investment, with no related specific allowance 425   284 260  
Commercial Real Estate - Improved Property [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 14,162   14,162   14,038
Recorded Investment, With no specific allowance recorded 7,982   7,982   9,293
Unpaid Principal Balance, With a specific allowance recorded 5,435   5,435    
Recorded Investment, With a specific allowance recorded 5,388   5,388    
Related Allowance, With a specific allowance recorded 1,471   1,471    
Average recorded investment, with no related specific allowance 7,647 10,409 7,962 11,000  
Interest income recognized, With no related specific allowance   15   383  
Average recorded investment, With a specific allowance recorded 5,273   3,170 1,052  
Interest income recognized, With a specific allowance recorded 35   63    
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 3,724   3,724   4,610
Recorded Investment, With no specific allowance recorded 2,374   2,374   $ 3,428
Unpaid Principal Balance, With a specific allowance recorded 187   187    
Recorded Investment, With a specific allowance recorded 185   185    
Related Allowance, With a specific allowance recorded 10   10    
Average recorded investment, with no related specific allowance 2,614 3,181 2,931 2,985  
Interest income recognized, With no related specific allowance   $ 5   $ 9  
Average recorded investment, With a specific allowance recorded 189   171    
Interest income recognized, With a specific allowance recorded $ 4   $ 11