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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded $ 42,361   $ 42,361   $ 49,794
Recorded Investment, With no specific allowance recorded 32,767   32,767   39,488
Total impaired loans, Unpaid principal balance 42,361   42,361   49,794
Total impaired loans, Recorded investment 32,767   32,767   39,488
Average recorded investment, with no related specific allowance 34,030 $ 38,906 36,163 $ 38,145  
Interest income recognized, With no related specific allowance 99 (10) 198 160  
Average recorded investment, With a specific allowance recorded   2,084   2,087  
Total impaired loans, Average recorded investment 34,030 40,990 36,163 40,232  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 22,264   22,264   25,492
Recorded Investment, With no specific allowance recorded 17,125   17,125   20,065
Average recorded investment, with no related specific allowance 17,467 21,549 18,327 21,198  
Interest income recognized, With no related specific allowance 24 (15) 96 125  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 698   698   869
Recorded Investment, With no specific allowance recorded 385   385   565
Average recorded investment, with no related specific allowance 396 411 468 384  
Interest income recognized, With no related specific allowance 1 1 3 2  
Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 6,486   6,486   6,985
Recorded Investment, With no specific allowance recorded 4,928   4,928   5,440
Average recorded investment, with no related specific allowance 5,046 5,544 5,279 5,591  
Interest income recognized, With no related specific allowance 14   20 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         74
Recorded Investment, With no specific allowance recorded         73
Average recorded investment, with no related specific allowance 27 110 70 202  
Interest income recognized, With no related specific allowance (2)        
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 8,424   8,424   9,846
Recorded Investment, With no specific allowance recorded 6,767   6,767   8,089
Average recorded investment, with no related specific allowance 7,086 6,271 7,505 6,987  
Interest income recognized, With no related specific allowance 57 6 71 23  
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 4,489   4,489   6,528
Recorded Investment, With no specific allowance recorded 3,562   3,562   $ 5,256
Average recorded investment, with no related specific allowance 4,010 5,021 4,514 3,783  
Interest income recognized, With no related specific allowance $ 5 $ (2) $ 8 $ 1