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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded $ 45,172   $ 45,172   $ 49,794
Recorded Investment, With no specific allowance recorded 35,293   35,293   39,488
Total impaired loans, Unpaid principal balance 45,172   45,172   49,794
Total impaired loans, Recorded investment 35,293   35,293   39,488
Average recorded investment, with no related specific allowance 36,354 $ 37,992 37,295 $ 38,231  
Interest income recognized, With no related specific allowance 47 115 99 170  
Average recorded investment, With a specific allowance recorded   2,084   2,087  
Total impaired loans, Average recorded investment 36,354 40,076 37,295 40,318  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 23,018   23,018   25,492
Recorded Investment, With no specific allowance recorded 17,809   17,809   20,065
Average recorded investment, with no related specific allowance 18,149 21,717 18,728 21,379  
Interest income recognized, With no related specific allowance 36 101 72 140  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 709   709   869
Recorded Investment, With no specific allowance recorded 406   406   565
Average recorded investment, with no related specific allowance 464 327 496 339  
Interest income recognized, With no related specific allowance 1 1 2 1  
Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 6,683   6,683   6,985
Recorded Investment, With no specific allowance recorded 5,163   5,163   5,440
Average recorded investment, with no related specific allowance 5,411 5,668 5,396 5,681  
Interest income recognized, With no related specific allowance 3 3 6 9  
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 53   53   74
Recorded Investment, With no specific allowance recorded 53   53   73
Average recorded investment, with no related specific allowance 105 97 94 221  
Interest income recognized, With no related specific allowance 1   2    
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 9,034   9,034   9,846
Recorded Investment, With no specific allowance recorded 7,404   7,404   8,089
Average recorded investment, with no related specific allowance 7,595 7,011 7,750 7,359  
Interest income recognized, With no related specific allowance 6 8 14 17  
Average recorded investment, With a specific allowance recorded   2,084   2,087  
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 5,675   5,675   6,528
Recorded Investment, With no specific allowance recorded 4,458   4,458   $ 5,256
Average recorded investment, with no related specific allowance $ 4,631 3,172 4,831 3,252  
Interest income recognized, With no related specific allowance   $ 2 $ 3 $ 3