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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded $ 38,832   $ 38,832   $ 50,951
Recorded Investment, With no specific allowance recorded 29,878   29,878   41,415
Total impaired loans, Unpaid principal balance 38,832   38,832   50,951
Total impaired loans, Recorded investment 29,878   29,878   41,415
Average recorded investment, with no related specific allowance 30,717 $ 34,030 35,517 $ 36,163  
Interest income recognized, With no related specific allowance   99   198  
Total impaired loans, Average recorded investment 30,717 34,030 35,517 36,163  
Total impaired loans, Interest income recognized   99   198  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 15,692   15,692   21,084
Recorded Investment, With no specific allowance recorded 11,013   11,013   16,057
Average recorded investment, with no related specific allowance 11,832 17,467 13,139 18,327  
Interest income recognized, With no related specific allowance   24   96  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 190   190   316
Recorded Investment, With no specific allowance recorded 116   116   159
Average recorded investment, with no related specific allowance 107 396 121 468  
Interest income recognized, With no related specific allowance   1   3  
Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 7,115   7,115   6,970
Recorded Investment, With no specific allowance recorded 5,322   5,322   5,374
Average recorded investment, with no related specific allowance 5,292 5,046 5,205 5,279  
Interest income recognized, With no related specific allowance   14   20  
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded         112
Recorded Investment, With no specific allowance recorded         112
Average recorded investment, with no related specific allowance   27 28 70  
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 13,092   13,092   18,367
Recorded Investment, With no specific allowance recorded 11,289   11,289   16,601
Average recorded investment, with no related specific allowance 11,243 7,086 14,322 7,505  
Interest income recognized, With no related specific allowance   57   71  
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 2,743   2,743   4,102
Recorded Investment, With no specific allowance recorded 2,138   2,138   $ 3,112
Average recorded investment, with no related specific allowance $ 2,244 4,010 $ 2,702 4,514  
Interest income recognized, With no related specific allowance   $ 5   $ 8