Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity	$ 1,159,676	$ 1,207,454
Net LHFI	13,717,540	13,517,162
Deposits	15,712,508	15,499,784
Federal funds purchased and securities sold under repurchase agreements	385,000	445,000
Other borrowings	292,532	364,762
Subordinated notes	172,042	171,966
Junior subordinated debt securities	61,856	61,856
Level 2 [Member] \| Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	526,593	668,007
Securities held to maturity	1,159,676	1,207,454
Deposits	15,712,508	15,499,784
Federal funds purchased and securities sold under repurchase agreements	385,000	445,000
Other borrowings	292,532	364,762
Subordinated notes	172,042	171,966
Junior subordinated debt securities	61,856	61,856
Level 2 [Member] \| Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	526,593	668,007
Securities held to maturity	1,127,076	1,180,569
Deposits	15,704,201	15,494,681
Federal funds purchased and securities sold under repurchase agreements	385,000	445,000
Other borrowings	292,532	364,762
Subordinated notes	175,000	176,750
Junior subordinated debt securities	52,578	52,964
Level 3 [Member] \| Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI	13,717,540	13,517,162
Level 3 [Member] \| Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI	$ 13,739,998	$ 13,544,873

Fair value portion 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.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Amount after offset of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.

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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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