FAIR VALUE - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025	Sep. 30, 2025
Financial Assets
Cash, due from banks, money market, and other interest-earning investments	$ 1,679,028	$ 1,826,177
Loans, net:
Loans, net	50,568,405	48,194,642
Deposits:
Noninterest-bearing demand deposits	12,847,561	13,247,483
Time deposits	10,852,364	9,661,024
Federal funds purchased and interbank borrowings	484	100,197
Securities sold under agreements to repurchase	240,698	261,366	$ 277,594
FHLB advances	5,484,611	6,237,375
Other borrowings	1,408,438	852,429
Carrying Value
Financial Assets
Cash, due from banks, money market, and other interest-earning investments	1,679,028	1,826,177
Loans, net:
Accrued interest receivable	308,943	306,812
Deposits:
Noninterest-bearing demand deposits	12,847,561	13,247,483
Checking, NOW, savings, and money market interest-bearing deposits	33,939,182	32,179,688
Time deposits	10,852,364	9,661,024
Federal funds purchased and interbank borrowings	484	100,197
Securities sold under agreements to repurchase	240,698	261,366
FHLB advances	5,484,611	6,237,375
Other borrowings	1,408,438	852,429
Accrued interest payable	66,631	65,291
Standby letters of credit	2,073	1,672
Off-Balance Sheet Financial Instruments
Commitments to extend credit	0	0
Carrying Value \| U.S. government-sponsored entities and agencies
Investment securities held-to-maturity:
Investment securities held to maturity	827,022	840,435
Carrying Value \| Mortgage-backed securities - Agency
Investment securities held-to-maturity:
Investment securities held to maturity	859,434	910,323
Carrying Value \| States and political subdivisions
Investment securities held-to-maturity:
Investment securities held to maturity	1,136,471	1,144,730
Carrying Value \| Commercial
Loans, net:
Loans, net	16,007,510	14,737,809
Carrying Value \| Commercial real estate
Loans, net:
Loans, net	22,451,446	21,780,686
Carrying Value \| Residential real estate
Loans, net:
Loans, net	8,880,932	8,433,102
Carrying Value \| Consumer credit
Loans, net:
Loans, net	3,228,517	3,243,045
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Cash, due from banks, money market, and other interest-earning investments	1,679,028	1,826,177
Loans, net:
Accrued interest receivable	1,106	894
Deposits:
Noninterest-bearing demand deposits	12,847,561	13,247,483
Checking, NOW, savings, and money market interest-bearing deposits	33,939,182	32,179,688
Time deposits	0	0
Federal funds purchased and interbank borrowings	484	100,197
Securities sold under agreements to repurchase	240,698	261,366
FHLB advances	0	0
Other borrowings	0	0
Accrued interest payable	0	0
Standby letters of credit	0	0
Off-Balance Sheet Financial Instruments
Commitments to extend credit	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government-sponsored entities and agencies
Investment securities held-to-maturity:
Investment securities held to maturity	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mortgage-backed securities - Agency
Investment securities held-to-maturity:
Investment securities held to maturity	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| States and political subdivisions
Investment securities held-to-maturity:
Investment securities held to maturity	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial
Loans, net:
Loans, net	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial real estate
Loans, net:
Loans, net	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Residential real estate
Loans, net:
Loans, net	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Consumer credit
Loans, net:
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2)
Financial Assets
Cash, due from banks, money market, and other interest-earning investments	0	0
Loans, net:
Accrued interest receivable	70,514	77,288
Deposits:
Noninterest-bearing demand deposits	0	0
Checking, NOW, savings, and money market interest-bearing deposits	0	0
Time deposits	10,787,734	9,540,748
Federal funds purchased and interbank borrowings	0	0
Securities sold under agreements to repurchase	0	0
FHLB advances	5,451,538	6,229,752
Other borrowings	1,393,695	853,938
Accrued interest payable	66,631	65,291
Standby letters of credit	0	0
Off-Balance Sheet Financial Instruments
Commitments to extend credit	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| U.S. government-sponsored entities and agencies
Investment securities held-to-maturity:
Investment securities held to maturity	646,493	710,909
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Mortgage-backed securities - Agency
Investment securities held-to-maturity:
Investment securities held to maturity	690,914	782,818
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| States and political subdivisions
Investment securities held-to-maturity:
Investment securities held to maturity	926,490	1,046,511
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Commercial
Loans, net:
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Commercial real estate
Loans, net:
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Residential real estate
Loans, net:
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Consumer credit
Loans, net:
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3)
Financial Assets
Cash, due from banks, money market, and other interest-earning investments	0	0
Loans, net:
Accrued interest receivable	237,323	228,630
Deposits:
Noninterest-bearing demand deposits	0	0
Checking, NOW, savings, and money market interest-bearing deposits	0	0
Time deposits	0	0
Federal funds purchased and interbank borrowings	0	0
Securities sold under agreements to repurchase	0	0
FHLB advances	0	0
Other borrowings	0	0
Accrued interest payable	0	0
Standby letters of credit	2,073	1,672
Off-Balance Sheet Financial Instruments
Commitments to extend credit	5,737	5,687
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| U.S. government-sponsored entities and agencies
Investment securities held-to-maturity:
Investment securities held to maturity	0	0
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Mortgage-backed securities - Agency
Investment securities held-to-maturity:
Investment securities held to maturity	0	0
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| States and political subdivisions
Investment securities held-to-maturity:
Investment securities held to maturity	0	0
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Commercial
Loans, net:
Loans, net	16,188,235	14,831,563
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Commercial real estate
Loans, net:
Loans, net	22,693,254	21,806,075
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Residential real estate
Loans, net:
Loans, net	7,965,104	7,526,511
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Consumer credit
Loans, net:
Loans, net	$ 3,313,561	$ 3,027,561

Checking, NOW, savings, and money market interest-bearing deposits.

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Fair Value Disclosure, off-Balance-Sheet Risks, Amount

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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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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Amount of interest payable on debt, including, but not limited to, trade payables.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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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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Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

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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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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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- Definition

Amount of time deposit liabilities, including certificates of deposit.

+ References

+ Details

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