v3.25.4

Fair Value Disclosures - Summary of the Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	$ 3,951,455	$ 3,524,686
Held-to-maturity debt securities	725,722	796,168
Equity securities	41,998	75,261
Trading securities	3,924	0
Derivative assets	40,892	23,202
Long-term debt	620,575	660,346
Derivative liabilities	24,458	57,906
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,099,118	3,188,808
Available-for-sale debt securities	3,951,455	3,524,686
Held-to-maturity debt securities	725,722	796,168
Equity securities	41,998	75,261
Trading securities	3,924
Loans held for sale	4,361
Loans held for investment, net	23,769,645	22,178,357
Derivative assets	40,892	23,202
Total deposits	26,448,767	25,238,599
Short-term borrowings	330,000	885,000
Long-term debt	620,575	660,346
Securities sold not yet purchased	12,026	33,705
Derivative liabilities	24,458	57,906
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,099,118	3,188,808
Available-for-sale debt securities	3,951,455	3,524,686
Held-to-maturity debt securities	654,832	678,174
Equity securities	41,998	75,261
Trading securities	3,924
Loans held for sale	4,361
Loans held for investment, net	23,604,206	22,115,585
Derivative assets	40,892	23,202
Total deposits	26,450,932	25,245,009
Short-term borrowings	330,000	885,000
Long-term debt	593,610	622,713
Securities sold not yet purchased	12,026	33,705
Derivative liabilities	24,458	57,906
Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,099,118	3,188,808
Available-for-sale debt securities	0	277,285
Held-to-maturity debt securities	0	0
Equity securities	31,998	59,235
Trading securities	0
Loans held for sale	0
Loans held for investment, net	0	0
Derivative assets	0	0
Total deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Securities sold not yet purchased	12,026	33,705
Derivative liabilities	0	0
Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Available-for-sale debt securities	3,940,658	3,235,475
Held-to-maturity debt securities	654,832	678,174
Equity securities	10,000	16,026
Trading securities	3,924
Loans held for sale	4,361
Loans held for investment, net	0	0
Derivative assets	40,892	23,202
Total deposits	0	0
Short-term borrowings	330,000	885,000
Long-term debt	593,610	622,713
Securities sold not yet purchased	0	0
Derivative liabilities	24,458	57,906
Level 3 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Available-for-sale debt securities	10,797	11,926
Held-to-maturity debt securities	0	0
Equity securities	0	0
Trading securities	0
Loans held for sale	0
Loans held for investment, net	23,604,206	22,115,585
Derivative assets	0	0
Total deposits	26,450,932	25,245,009
Short-term borrowings	0	0
Long-term debt	0	0
Securities sold not yet purchased	0	0
Derivative liabilities	$ 0	$ 0

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