v3.26.3
Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment $ 174,132   $ 174,132   $ 91,584
Non-accrual Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 128,653   128,653   93,598
Recorded Investment, With no specific allowance recorded 103,036   103,036   73,136
Unpaid Principal Balance, With a specific allowance recorded 60,227   60,227   18,586
Recorded Investment, With a specific allowance recorded 51,934   51,934   18,448
Related Allowance, With a specific allowance recorded 28,158   28,158   13,295
Total impaired loans, Unpaid principal balance 188,880   188,880   112,184
Total impaired loans, Recorded investment 154,970   154,970   91,584
Total impaired loans, Related Allowance 28,158   28,158   13,295
Average recorded investment, With no related specific allowance 106,494 $ 65,957 101,759 $ 59,990  
Average recorded investment, With a specific allowance recorded 47,975 23,447 34,623 15,023  
Total impaired loans, Average recorded investment 154,469 89,404 136,382 75,013  
Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 78,616   78,616   30,586
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 43,625   43,625   34,332
Residential Real Estate [Member] | Non-accrual Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 55,416   55,416   44,292
Recorded Investment, With no specific allowance recorded 43,625   43,625   34,332
Average recorded investment, With no related specific allowance 40,273 27,963 37,423 23,613  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 333   333   1,326
Consumer [Member] | Non-accrual Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 1,321   1,321   2,875
Recorded Investment, With no specific allowance recorded 333   333   1,326
Average recorded investment, With no related specific allowance 322 2,087 750 1,901  
Home Equity [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 10,492   10,492   9,248
Home Equity [Member] | Non-accrual Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 14,059   14,059   12,673
Recorded Investment, With no specific allowance recorded 10,492   10,492   9,248
Average recorded investment, With no related specific allowance 10,328 8,338 9,934 7,660  
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 27,432   27,432   832
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Non-accrual Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 15,364   15,364   832
Recorded Investment, With no specific allowance recorded 15,265   15,265   832
Unpaid Principal Balance, With a specific allowance recorded 20,112   20,112    
Recorded Investment, With a specific allowance recorded 12,167   12,167    
Related Allowance, With a specific allowance recorded 763   763    
Average recorded investment, With no related specific allowance 15,660 1,526 15,089 763  
Average recorded investment, With a specific allowance recorded 16,140   8,070    
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 51,184   51,184   29,754
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Non-accrual Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 19,651   19,651   20,883
Recorded Investment, With no specific allowance recorded 16,782   16,782   18,265
Unpaid Principal Balance, With a specific allowance recorded 34,750   34,750   11,627
Recorded Investment, With a specific allowance recorded 34,402   34,402   11,489
Related Allowance, With a specific allowance recorded 23,180   23,180   6,377
Average recorded investment, With no related specific allowance 25,064 16,934 25,420 18,463  
Average recorded investment, With a specific allowance recorded 25,670 14,099 19,991 8,609  
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Total impaired loans, Recorded investment 21,904   21,904   16,092
Commercial and Industrial [Member] | Non-accrual Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance, With no specific allowance recorded 22,842   22,842   12,043
Recorded Investment, With no specific allowance recorded 16,539   16,539   9,133
Unpaid Principal Balance, With a specific allowance recorded 5,365   5,365   6,959
Recorded Investment, With a specific allowance recorded 5,365   5,365   6,959
Related Allowance, With a specific allowance recorded 4,215   4,215   $ 6,918
Average recorded investment, With no related specific allowance 14,847 9,109 13,143 7,590  
Average recorded investment, With a specific allowance recorded $ 6,165 $ 9,348 $ 6,562 $ 6,414