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Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment $ 35,468   $ 35,468   $ 26,808
Nonperforming Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 46,051   46,051   35,493
Recorded Investment, With no specific allowance recorded 35,468   35,468   26,808
Total impaired loans, Unpaid principal balance 46,051   46,051   35,493
Total impaired loans, Recorded investment 35,468   35,468   26,808
Average recorded investment, with no related specific allowance 34,194 $ 35,386 31,732 $ 37,394  
Total impaired loans, Average recorded investment 34,194 35,386 31,732 37,394  
Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 16,940   16,940   9,557
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 11,005   11,005   10,582
Residential Real Estate [Member] | Nonperforming Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 15,638   15,638   15,128
Recorded Investment, With no specific allowance recorded 11,005   11,005   10,582
Average recorded investment, with no related specific allowance 11,342 12,744 11,089 13,848  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 64   64   51
Consumer [Member] | Nonperforming Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 114   114   104
Recorded Investment, With no specific allowance recorded 64   64   51
Average recorded investment, with no related specific allowance 69 104 63 122  
Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 5,401   5,401   4,777
Home Equity [Member] | Nonperforming Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 7,144   7,144   6,521
Recorded Investment, With no specific allowance recorded 5,401   5,401   4,777
Average recorded investment, with no related specific allowance 5,035 5,061 4,949 5,165  
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 184   184    
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Nonperforming Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 1,023   1,023    
Recorded Investment, With no specific allowance recorded 184   184    
Average recorded investment, with no related specific allowance 197   131 37  
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 16,756   16,756   9,557
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Nonperforming Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 18,874   18,874   11,248
Recorded Investment, With no specific allowance recorded 16,756   16,756   9,557
Average recorded investment, with no related specific allowance 15,140 14,698 13,279 15,332  
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 2,058   2,058   1,841
Commercial and Industrial [Member] | Nonperforming Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 3,258   3,258   2,492
Recorded Investment, With no specific allowance recorded 2,058   2,058   $ 1,841
Average recorded investment, with no related specific allowance $ 2,412 $ 2,780 $ 2,221 $ 2,890