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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded $ 48,352   $ 48,352   $ 50,124
Total impaired loans, Unpaid principal balance 48,352   48,352   52,229
Recorded Investment, With no specific allowance recorded 38,441   38,441   41,291
Total impaired loans, Recorded investment 38,441   38,441   43,396
Unpaid Principal Balance, With a specific allowance recorded         2,105
Recorded Investment, With a specific allowance recorded         2,105
Related Allowance, With a specific allowance recorded         388
Average recorded investment, with no related specific allowance 38,130 $ 38,802 39,066 $ 37,582  
Interest income recognized, With no related specific allowance 94 97 515 521  
Average recorded investment, With a specific allowance recorded 1,052 5,999 1,403 5,426  
Interest income recognized, With a specific allowance recorded 0 0 0 0  
Total impaired loans, Average recorded investment 39,182 44,801 40,469 43,008  
Total impaired loans, Interest income recognized 94 97 515 521  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 20,312   20,312   20,821
Recorded Investment, With no specific allowance recorded 18,379   18,379   18,982
Average recorded investment, with no related specific allowance 18,264 17,787 18,434 17,959  
Interest income recognized, With no related specific allowance 61 66 127 135  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 875   875   1,084
Recorded Investment, With no specific allowance recorded 713   713   952
Average recorded investment, with no related specific allowance 758 733 823 737  
Interest income recognized, With no related specific allowance 2 1 5 3  
Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 5,978   5,978   5,833
Recorded Investment, With no specific allowance recorded 5,143   5,143   5,169
Average recorded investment, with no related specific allowance 5,068 4,485 5,098 4,327  
Interest income recognized, With no related specific allowance 6 5 11 10  
Commercial Real Estate - Land and Construction [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded         412
Recorded Investment, With no specific allowance recorded         239
Average recorded investment, with no related specific allowance 400 411 346 529  
Interest income recognized, With a specific allowance recorded 0 0 0 0  
Commercial Real Estate - Improved Property [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 15,521   15,521   18,229
Recorded Investment, With no specific allowance recorded 10,889   10,889   12,863
Unpaid Principal Balance, With a specific allowance recorded         2,105
Recorded Investment, With a specific allowance recorded         2,105
Related Allowance, With a specific allowance recorded         388
Average recorded investment, with no related specific allowance 10,604 11,118 11,357 10,125  
Interest income recognized, With no related specific allowance 23 23 368 369  
Average recorded investment, With a specific allowance recorded 1,052 5,999 1,403 5,003  
Interest income recognized, With a specific allowance recorded 0 0 0 0  
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 5,666   5,666   3,745
Recorded Investment, With no specific allowance recorded 3,317   3,317   $ 3,086
Average recorded investment, with no related specific allowance 3,036 4,268 3,008 3,905  
Interest income recognized, With no related specific allowance 2 2 4 4  
Average recorded investment, With a specific allowance recorded       423  
Interest income recognized, With a specific allowance recorded $ 0 $ 0 $ 0 $ 0