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Loans and the Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded $ 37,167   $ 37,167   $ 45,688
Recorded Investment, With no specific allowance recorded 27,118   27,118   36,444
Unpaid Principal Balance, With a specific allowance recorded 11,866   11,866    
Recorded Investment, With a specific allowance recorded 11,267   11,267    
Related Allowance, With a specific allowance recorded 1,511   1,511    
Total impaired loans, Unpaid principal balance 49,033   49,033   45,688
Total impaired loans, Recorded investment 38,385   38,385   36,444
Total impaired loans, Related Allowance 1,511   1,511    
Average recorded investment, with no related specific allowance 27,207 $ 38,130 30,284 $ 39,066  
Interest income recognized, With no related specific allowance   94   515  
Average recorded investment, With a specific allowance recorded 9,843 1,052 6,561 1,403  
Interest income recognized, With a specific allowance recorded 86   170    
Total impaired loans, Average recorded investment 37,050 39,182 36,845 40,469  
Total impaired loans, Interest income recognized 86 94 170 515  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 13,572   13,572   20,270
Recorded Investment, With no specific allowance recorded 11,896   11,896   18,016
Unpaid Principal Balance, With a specific allowance recorded 5,358   5,358    
Recorded Investment, With a specific allowance recorded 4,922   4,922    
Related Allowance, With a specific allowance recorded 12   12    
Average recorded investment, with no related specific allowance 11,845 18,264 13,902 18,434  
Interest income recognized, With no related specific allowance   61   127  
Average recorded investment, With a specific allowance recorded 5,000   3,333    
Interest income recognized, With a specific allowance recorded 60   118    
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 416   416   846
Recorded Investment, With no specific allowance recorded 311   311   671
Unpaid Principal Balance, With a specific allowance recorded 113   113    
Recorded Investment, With a specific allowance recorded 74   74    
Related Allowance, With a specific allowance recorded 1   1    
Average recorded investment, with no related specific allowance 337 758 448 823  
Interest income recognized, With no related specific allowance   2   5  
Average recorded investment, With a specific allowance recorded 89   59    
Interest income recognized, With a specific allowance recorded 1   2    
Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 5,247   5,247   5,924
Recorded Investment, With no specific allowance recorded 4,450   4,450   5,036
Unpaid Principal Balance, With a specific allowance recorded 990   990    
Recorded Investment, With a specific allowance recorded 922   922    
Related Allowance, With a specific allowance recorded 8   8    
Average recorded investment, with no related specific allowance 4,487 5,068 4,670 5,098  
Interest income recognized, With no related specific allowance   6   11  
Average recorded investment, With a specific allowance recorded 859   573    
Interest income recognized, With a specific allowance recorded 7   15    
Commercial Real Estate - Land and Construction [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 347   347    
Recorded Investment, With no specific allowance recorded 295   295    
Average recorded investment, with no related specific allowance 290 400 193 346  
Commercial Real Estate - Improved Property [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 13,499   13,499   14,038
Recorded Investment, With no specific allowance recorded 7,312   7,312   9,293
Unpaid Principal Balance, With a specific allowance recorded 5,211   5,211    
Recorded Investment, With a specific allowance recorded 5,157   5,157    
Related Allowance, With a specific allowance recorded 1,479   1,479    
Average recorded investment, with no related specific allowance 7,287 10,604 7,955 11,357  
Interest income recognized, With no related specific allowance   23   368  
Average recorded investment, With a specific allowance recorded 3,645 1,052 2,430 1,403  
Interest income recognized, With a specific allowance recorded 14   28    
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 4,086   4,086   4,610
Recorded Investment, With no specific allowance recorded 2,854   2,854   $ 3,428
Unpaid Principal Balance, With a specific allowance recorded 194   194    
Recorded Investment, With a specific allowance recorded 192   192    
Related Allowance, With a specific allowance recorded 11   11    
Average recorded investment, with no related specific allowance 2,961 3,036 3,116 3,008  
Interest income recognized, With no related specific allowance   $ 2   $ 4  
Average recorded investment, With a specific allowance recorded 250   166    
Interest income recognized, With a specific allowance recorded $ 4   $ 7