Fair Value of Financial Instruments - Schedule of Carrying Amount and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial assets
Cash and due from banks	$ 744,263	$ 608,800
Certificates of deposit with other banks	250	250
Carrying Amount
Financial assets
Cash and due from banks	744,263	608,800
Certificates of deposit with other banks	250	250
Loans held for sale	367,955	346,002
Loans and leases held for investment, net of allowance for credit losses on loans and leases	10,186,920	9,737,112
Financial liabilities
Deposits	12,395,945	11,760,494
Borrowings	110,247	112,820
Estimate of Fair Value Measurement
Financial assets
Cash and due from banks	744,263	608,800
Certificates of deposit with other banks	250	250
Loans held for sale	390,155	367,993
Loans and leases held for investment, net of allowance for credit losses on loans and leases	10,096,104	9,556,981
Financial liabilities
Deposits	11,953,670	11,317,639
Borrowings	117,449	121,026
Level 1 \| Estimate of Fair Value Measurement
Financial assets
Cash and due from banks	744,263	608,800
Certificates of deposit with other banks	250	250
Loans held for sale	0	0
Loans and leases held for investment, net of allowance for credit losses on loans and leases	0	0
Financial liabilities
Deposits	0	0
Borrowings	0	0
Level 2 \| Estimate of Fair Value Measurement
Financial assets
Cash and due from banks	0	0
Certificates of deposit with other banks	0	0
Loans held for sale	0	0
Loans and leases held for investment, net of allowance for credit losses on loans and leases	0	0
Financial liabilities
Deposits	11,953,670	11,317,639
Borrowings	0	0
Level 3 \| Estimate of Fair Value Measurement
Financial assets
Cash and due from banks	0	0
Certificates of deposit with other banks	0	0
Loans held for sale	390,155	367,993
Loans and leases held for investment, net of allowance for credit losses on loans and leases	10,096,104	9,556,981
Financial liabilities
Deposits	0	0
Borrowings	$ 117,449	$ 121,026

For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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