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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
FINANCIAL ASSETS |  |
Federal funds sold, Carrying Amount | $ 6,875 | $ 2,850
Debt securities held for investment, Carrying Amount | 1,192 | 2,383
Loans, net of allowance for credit losses, Carrying Amount | 7,374,846 | 6,850,835
Debt securities held for investment, Fair Value | 1,192 | 2,383
Loans held for sale, Fair Value | 3,852 | 6,232
FINANCIAL LIABILITIES |  |
Deposits, Carrying Amount | 10,534,171 | 10,974,228
Short-term borrowings, Carrying Amount | 3,976 | 300
Subordinated debt, Carrying Amount | 86,086 | 86,044
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS |  |
Loan commitments, Fair Value | 4,714 | 4,598
Letters of credit, Fair Value | 589 | 542
Level 2 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents, Carrying Amount | 2,336,761 | 3,168,910
Federal funds sold, Carrying Amount | 6,875 | 2,850
Debt securities held for investment, Carrying Amount | 7 | 13
Loans held for sale, Carrying Amount | 3,852 | 6,232
Cash and cash equivalents, Fair Value | 2,336,761 | 3,168,910
Federal funds sold, Fair Value | 6,875 | 2,850
Debt securities held for investment, Fair Value | 7 | 13
Loans held for sale, Fair Value | 3,852 | 6,232
FINANCIAL LIABILITIES |  |
Deposits, Carrying Amount | 10,534,171 | 10,974,228
Short-term borrowings, Carrying Amount | 3,976 | 300
Subordinated debt, Carrying Amount | 86,086 | 86,044
Deposits, Fair Value | 10,098,240 | 10,614,840
Short-term borrowings, Fair Value | 3,976 | 300
Subordinated debt, Fair Value | 76,771 | 82,385
Level 3 Inputs [Member] |  |
FINANCIAL ASSETS |  |
Debt securities held for investment, Carrying Amount | 1,185 | 2,370
Loans, net of allowance for credit losses, Carrying Amount | 7,374,846 | 6,850,835
Debt securities held for investment, Fair Value | 1,185 | 2,370
Loans, net of allowance for credit losses, Fair Value | $ 7,065,173 | $ 6,563,755

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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- Definition The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount after allowance and 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 and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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