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Allowance for Credit Losses - Progression of Allowance for Credit Losses Including Allowance for Loan Losses and Reserve for Lending-Related Commitments (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Receivables [Abstract]      
Balance of allowance for loan losses at beginning of period $ 271,844,000 $ 259,237,000 $ 234,746,000
Initial allowance for PCD loans (acquired during the period) 17,518,000 0 0
Gross charge-offs (50,912,000) (17,530,000) (11,304,000)
Recoveries 5,200,000 4,985,000 4,641,000
Net charge-offs (45,712,000) (12,545,000) (6,663,000)
Provision for loan and lease losses 53,868,000 25,152,000 31,154,000
Balance of allowance for loan losses at end of period 297,518,000 271,844,000 259,237,000
Reserve for lending-related commitments 35,075,000 34,911,000 44,706,000
Balance of allowance for credit losses at end of period $ 332,593,000 $ 306,755,000 $ 303,943,000