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Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - Nonperforming Loans [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded $ 44,387   $ 45,717
Recorded Investment, With no specific allowance recorded 37,169   41,097
Unpaid Principal Balance, With a specific allowance recorded 2,632   10,000
Recorded Investment, With a specific allowance recorded 2,632   9,247
Related Allowance, With a specific allowance recorded 193   124
Total impaired loans, Unpaid principal balance 47,019   55,717
Total impaired loans, Recorded investment 39,801   50,344
Total impaired loans, Related Allowance 193   124
Average recorded investment, with no related specific allowance 39,135 $ 30,670  
Interest income recognized, With no related specific allowance 85    
Average recorded investment, With a specific allowance recorded 5,941 4,210  
Interest income recognized, With a specific allowance recorded   84  
Total impaired loans, Average recorded investment 45,076 34,880  
Total impaired loans, Interest income recognized 85 84  
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 23,767   17,753
Recorded Investment, With no specific allowance recorded 20,987   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 18,470 13,774  
Interest income recognized, With no related specific allowance 55    
Average recorded investment, With a specific allowance recorded 2,196 2,539  
Interest income recognized, With a specific allowance recorded   58  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 541   546
Recorded Investment, With no specific allowance recorded 366   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 390 450  
Interest income recognized, With no related specific allowance 1    
Average recorded investment, With a specific allowance recorded 27 52  
Interest income recognized, With a specific allowance recorded   1  
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 7,118   6,523
Recorded Investment, With no specific allowance recorded 6,012   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 5,811 4,780  
Interest income recognized, With no related specific allowance 6    
Average recorded investment, With a specific allowance recorded 352 398  
Interest income recognized, With a specific allowance recorded   8  
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 238   616
Recorded Investment, With no specific allowance recorded 205   580
Average recorded investment, with no related specific allowance 393 143  
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 8,750   5,097
Recorded Investment, With no specific allowance recorded 6,772   4,229
Unpaid Principal Balance, With a specific allowance recorded 2,632   4,207
Recorded Investment, With a specific allowance recorded 2,632   3,907
Related Allowance, With a specific allowance recorded 193   93
Average recorded investment, with no related specific allowance 5,501 8,277  
Interest income recognized, With no related specific allowance 20    
Average recorded investment, With a specific allowance recorded 3,270 1,067  
Interest income recognized, With a specific allowance recorded   14  
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance, With no specific allowance recorded 3,973   15,182
Recorded Investment, With no specific allowance recorded 2,827   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 8,570 3,246  
Interest income recognized, With no related specific allowance 3    
Average recorded investment, With a specific allowance recorded $ 96 154  
Interest income recognized, With a specific allowance recorded   $ 3