v3.26.3
Loans and the Allowance for Credit Losses - Summary of Loans with FDMs Subsequently Defaulted (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted $ 108 $ 25,558 $ 298 $ 29,259
Payment Delay [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   657   890
Term Extension [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   24,901 190 28,369
Rate Reduction [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted 108   108  
Commercial and Industrial [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   1,381 190 1,381
Commercial and Industrial [Member] | Term Extension [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   1,381 190 1,381
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   23,520   26,988
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | Term Extension [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   23,520   26,988
Residential Real Estate [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted 108 387 108 510
Residential Real Estate [Member] | Payment Delay [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   387   510
Residential Real Estate [Member] | Rate Reduction [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted $ 108   $ 108  
Home Equity [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   175   286
Home Equity [Member] | Payment Delay [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   175   286
Consumer [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   95   94
Consumer [Member] | Payment Delay [Member]        
Financing Receivable, Modified [Line Items]        
Loans that subsequently defaulted   $ 95   $ 94