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Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged     $ 2,110,755,000 $ 2,430,117,000
Total charge-offs     28,437,000 31,819,000
Recorded investment of PCD Loans     43,800,000 51,000,000
Recorded investment, estimated allowance for credit loss     262,000 529,000
Recorded investment, PCD Discount (Premium)     3,000,000 3,800,000
Recovery of credit losses     18,467,000 4,851,000
Financing Receivable, Modified in Period, Amount     3,520,000 44,060,000
Financing receivable, allowance for credit loss, writeoff     28,437,000 31,819,000
Unfunded commitments     0 0
Mortgage loans with amortized cost     169,000 134,000
Accrued interest receivable     12,537,000 14,967,000
Accrued interest excluded from ACL     10,700,000 13,200,000
Interest income from nonaccrual loans     534,000 223,000
Payment Deferral [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Financing Receivable, Modified in Period, Amount     1,346,000 759,000
Reclassification [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total charge-offs   $ 9,400,000    
Financing receivable, allowance for credit loss, writeoff   $ 9,400,000    
Related Party [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Recovery of credit losses $ 8,400,000      
Doubtful [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged     1,654,000 37,137,000
Commercial and industrial loan amount       37,100,000
Collective specific reserve       9,600,000
Attributable to specific reserve       34,200,000
Grade 7 Substandard [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged     64,697,000 56,687,000
Commercial and Residential Mortgages [Member] | Asset Pledged As Collateral Without Right [Member] | Federal Home Loan Bank Advances [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged     797,900,000 767,100,000
Commercial and Industrial [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged     354,904,000 508,944,000
Total charge-offs     24,005,000 27,837,000
Recovery of credit losses     17,348,000 3,675,000
Financing Receivable, Modified in Period, Amount       32,800,000
Financing receivable, allowance for credit loss, writeoff     24,005,000 27,837,000
Commercial and Industrial [Member] | Payment Deferral [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Financing Receivable, Modified in Period, Amount     836,000 182,000
Commercial and Industrial [Member] | Asset Pledged As Collateral Without Right [Member] | FRB [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged     91,600,000 161,000,000
Commercial and Industrial [Member] | Doubtful [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged     83,000 37,136,000
Commercial and Industrial [Member] | Grade 7 Substandard [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Loans pledged     $ 22,157,000 $ 15,197,000