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COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2024	Dec. 31, 2021	Jun. 30, 2020
Commitments and Contingencies Disclosure [Line Items]
Reserves for unfunded commitments	$ 16,900	$ 18,400
Loans and Leases Receivable, Commitments, Fixed Rates	69,300	108,200
Loans and Leases Receivable, Commitments, Variable Rates	$ 3,700,000	$ 4,400,000
Loan Commitments, Fixed Interest Rate Range, Minimum	0.00%	0.00%
Loan Commitments, Fixed Interest Rate Range, Maximum	21.00%	21.00%
Loan Commitments, Fixed Rate, Maturities, Minimum	1 year	1 year
Loan Commitments, Fixed Rate, Maturities, Maximum	31 years 7 months 6 days	31 years 7 months 6 days
Letters of credit issued to guarantee performance of a client to a third party	$ 25,100	$ 34,900
Derivative, Notional Amount	16,941,027	19,339,867
Litigation Settlement, Expense	0
Payments for Legal Settlements			$ 3,300
Estimated Litigation Liability						$ 0
Shareholders’ equity	2,438,041	2,267,974	2,041,373		$ 2,258,942
Retained earnings
Commitments and Contingencies Disclosure [Line Items]
Shareholders’ equity	1,276,329	1,136,718	$ 968,237		$ 837,473
Cumulative Effect, Period of Adoption, Adjustment
Commitments and Contingencies Disclosure [Line Items]
Shareholders’ equity		599
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings
Commitments and Contingencies Disclosure [Line Items]
Shareholders’ equity		599		$ 600
Credit Default Swap
Commitments and Contingencies Disclosure [Line Items]
Derivative, Notional Amount	310,700	341,700
Commitments to Extend Credit
Commitments and Contingencies Disclosure [Line Items]
Commitments outstanding to extend credit	$ 3,800,000	$ 4,500,000

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Maximum interest rate range of loan commitments with fixed interest rates.

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Loan commitments with a fixed interest rate minimum interest rate range.

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The maximum maturity of fixed rate loan commitments.

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Reserves for unfunded commitments

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates.

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