Fair Value of Financial Instruments - Schedule of Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financial assets
Cash and due from banks	$ 927,630	$ 864,904
Certificates of deposit with other banks	250	250
Carrying Amount
Financial assets
Cash and due from banks	927,630	864,904
Certificates of deposit with other banks	250	250
Loans held for sale	511,812	420,055
Loans and leases held for investment, net of allowance for credit losses on loans and leases	12,205,354	11,520,733
Financial liabilities
Deposits	14,547,526	13,688,659
Borrowings	99,766	102,404
Estimate of Fair Value Measurement
Financial assets
Cash and due from banks	927,630	864,904
Certificates of deposit with other banks	250	250
Loans held for sale	544,273	440,928
Loans and leases held for investment, net of allowance for credit losses on loans and leases	12,030,048	11,329,479
Financial liabilities
Deposits	13,819,089	13,096,941
Borrowings	104,051	110,782
Estimate of Fair Value Measurement \| Level 1
Financial assets
Cash and due from banks	927,630	864,904
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
Estimate of Fair Value Measurement \| Level 2
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	13,819,089	13,096,941
Borrowings	0	0
Estimate of Fair Value Measurement \| Level 3
Financial assets
Cash and due from banks	0	0
Certificates of deposit with other banks	0	0
Loans held for sale	544,273	440,928
Loans and leases held for investment, net of allowance for credit losses on loans and leases	12,030,048	11,329,479
Financial liabilities
Deposits	0	0
Borrowings	$ 104,051	$ 110,782

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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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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