Loans and Leases - Accruing and Nonaccruing Modified Loans to Borrowers Experiencing Financial Difficulty (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2023 USD ($) loan Rate	Dec. 31, 2022 USD ($)
Financing Receivable, Modified Loans [Line Items]
Loans and leases held for investment	$ 6,567,214	$ 6,123,230
Accrual Modified Loans
Financing Receivable, Modified Loans [Line Items]
Number of loans \| loan	2
Amortized Cost Basis*	$ 4,863
Related allowance	10
Loans and leases held for investment	$ 4,863
Accrual Modified Loans \| Maturity Date Extension [Member]
Financing Receivable, Modified Loans [Line Items]
Number of loans \| loan	2
Nonaccrual Modified Loans
Financing Receivable, Modified Loans [Line Items]
Number of loans \| loan	1
Amortized Cost Basis*	$ 1,741
Related allowance	0
Loans and leases held for investment	$ 1,741
Nonaccrual Modified Loans \| Maturity Date Extension [Member]
Financing Receivable, Modified Loans [Line Items]
Number of loans \| loan	1
Real Estate-Commercial [Member]
Financing Receivable, Modified Loans [Line Items]
Loans and leases held for investment	$ 3,302,798	$ 3,027,955
Real Estate-Commercial [Member] \| Accrual Modified Loans
Financing Receivable, Modified Loans [Line Items]
Amortized Cost Basis*	$ 4,863
Percent of total class of financing receivable \| Rate	0.15%
Related allowance	$ 10
Loans and leases held for investment	$ 4,863
Real Estate-Commercial [Member] \| Accrual Modified Loans \| Maturity Date Extension [Member]
Financing Receivable, Modified Loans [Line Items]
Number of loans \| loan	2
Real Estate-Commercial [Member] \| Nonaccrual Modified Loans
Financing Receivable, Modified Loans [Line Items]
Number of loans \| loan	1
Amortized Cost Basis*	$ 1,741
Percent of total class of financing receivable \| Rate	0.05%
Related allowance	$ 0
Loans and leases held for investment	$ 1,741
Real Estate-Commercial [Member] \| Nonaccrual Modified Loans \| Maturity Date Extension [Member]
Financing Receivable, Modified Loans [Line Items]
Number of loans \| loan	1

Percentage of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Reflects the amount of the allowance related to a troubled debt restructuring.

+ References

No definition available.

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