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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
FINANCIAL ASSETS |  |
Federal funds sold, Carrying Amount | $ 0 | $ 1,316
Debt securities held for investment, Carrying Amount | 838 | 1,190
Loans, net of allowance for credit losses, Carrying Amount | 8,078,479 | 7,559,845
Debt securities held for investment, Fair Value | 838 | 1,190
Loans held for sale, Fair Value | 7,841 | 3,489
FINANCIAL LIABILITIES |  |
Deposits, Carrying Amount | 11,474,352 | 10,700,122
Short-term borrowings, Carrying Amount | 4,429 | 3,351
Subordinated debt, Carrying Amount | 86,143 | 86,101
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |
Loan commitments, Fair Value | 4,597 | 4,875
Letters of credit, Fair Value | 701 | 637
Level 2 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents, Carrying Amount | 2,992,073 | 2,397,463
Federal funds sold, Carrying Amount | 0 | 1,316
Debt securities held for investment, Carrying Amount | 3 | 5
Loans held for sale, Carrying Amount | 7,841 | 3,489
Cash and cash equivalents, Fair Value | 2,992,073 | 2,397,463
Federal funds sold, Fair Value | 0 | 1,316
Debt securities held for investment, Fair Value | 3 | 5
Loans held for sale, Fair Value | 7,841 | 3,489
FINANCIAL LIABILITIES |  |
Deposits, Carrying Amount | 11,474,352 | 10,700,122
Short-term borrowings, Carrying Amount | 4,429 | 3,351
Subordinated debt, Carrying Amount | 86,143 | 86,101
Deposits, Fair Value | 11,244,035 | 10,413,348
Short-term borrowings, Fair Value | 4,429 | 3,351
Subordinated debt, Fair Value | 80,227 | 79,271
Level 3 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Debt securities held for investment, Carrying Amount | 835 | 1,185
Loans, net of allowance for credit losses, Carrying Amount | 8,078,479 | 7,559,845
Debt securities held for investment, Fair Value | 835 | 1,185
Loans, net of allowance for credit losses, Fair Value | $ 9,007,747 | $ 7,356,768

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