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Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial Assets    
Cash and due from banks $ 1,008,237 $ 568,137
Equity securities 30,374 13,427
Available-for-sale debt securities 3,268,016 2,246,072
Net held-to-maturity debt securities 1,150,520 1,152,906
Net loans 18,714,408 12,517,663
Loans held for sale 125,971 18,695
Accrued interest receivable 108,865 78,324
Financial Liabilities    
Deposits 21,284,262 14,133,717
Federal Home Loan Bank borrowings 1,275,000 1,000,000
Other borrowings 113,501 192,073
Subordinated debt and junior subordinated debt 358,373 279,308
Accrued interest payable 25,472 14,228
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial Assets    
Cash and due from banks 1,008,237 568,137
Equity securities 30,374 13,427
Accrued interest receivable 108,865 78,324
Financial Liabilities    
Deposits 18,353,894 12,406,785
Other borrowings 109,214 180,372
Accrued interest payable 25,472 14,228
Significant Other Observable Inputs (Level 2) [Member]    
Financial Assets    
Available-for-sale debt securities 3,265,464 2,244,988
Net held-to-maturity debt securities 1,042,334 1,006,617
Loans held for sale 125,971 18,695
Other assets - interest rate derivatives 65,321 72,343
Financial Liabilities    
Deposits 2,916,789 1,714,530
Federal Home Loan Bank borrowings 1,275,984 1,000,371
Subordinated debt and junior subordinated debt 352,051 262,101
Other liabilities - interest rate derivatives 66,886 72,204
Significant Unobservable Inputs (Level 3) [Member]    
Financial Assets    
Available-for-sale debt securities 2,552 1,084
Net held-to-maturity debt securities 169 200
Net loans 18,296,204 12,042,064
Carrying Amount [Member]    
Financial Assets    
Cash and due from banks 1,008,237 568,137
Equity securities 30,374 13,427
Available-for-sale debt securities 3,268,016 2,246,072
Net held-to-maturity debt securities 1,150,339 1,152,760
Net loans 18,714,408 12,517,663
Loans held for sale 125,971 18,695
Other assets - interest rate derivatives 65,321 72,343
Accrued interest receivable 108,865 78,324
Financial Liabilities    
Deposits 21,284,262 14,133,717
Federal Home Loan Bank borrowings 1,275,000 1,000,000
Other borrowings 113,501 192,073
Subordinated debt and junior subordinated debt 358,373 279,308
Other liabilities - interest rate derivatives 66,886 72,204
Accrued interest payable 25,472 14,228
Fair Value Estimate [Member]    
Financial Assets    
Cash and due from banks 1,008,237 568,137
Equity securities 30,374 13,427
Available-for-sale debt securities 3,268,016 2,246,072
Net held-to-maturity debt securities 1,042,503 1,006,817
Net loans 18,296,204 12,042,064
Loans held for sale 125,971 18,695
Other assets - interest rate derivatives 65,321 72,343
Accrued interest receivable 108,865 78,324
Financial Liabilities    
Deposits 21,270,683 14,121,315
Federal Home Loan Bank borrowings 1,275,984 1,000,371
Other borrowings 109,214 180,372
Subordinated debt and junior subordinated debt 352,051 262,101
Other liabilities - interest rate derivatives 66,886 72,204
Accrued interest payable $ 25,472 $ 14,228