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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Jan. 01, 2024 | Dec. 31, 2023
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Reserves for unfunded commitments | $ 17,600 | $ 16,900 |  |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | 71,100 | 69,300 |  |  |  |  |
Loans and Leases Receivable, Commitments, Variable Rates | $ 4,000,000 | $ 3,700,000 |  |  |  |  |
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 | 31 years 7 months 6 days |  |  |  |  |
Letters of credit issued to guarantee performance of a client to a third party | $ 26,500 | $ 25,100 |  |  |  |  |
Derivative, Notional Amount | 20,507,545 | 16,941,027 |  |  |  |  |
Stockholders' Equity Attributable to Parent | 2,631,855 | 2,438,041 | $ 2,558,155 | $ 2,450,438 | $ 2,326,439 |  | $ 2,267,974
Estimated Litigation Liability | 0 | 0 |  |  |  |  |
Retained earnings |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 1,399,577 | 1,276,329 | $ 1,351,674 | $ 1,234,375 | $ 1,204,844 |  | $ 1,136,718
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained earnings |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  |  |  |  |  | $ 600 |
Credit Default Swap |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount | 298,200 | 310,700 |  |  |  |  |
Commitments to Extend Credit |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Commitments outstanding to extend credit | $ 4,100,000 | $ 3,800,000 |  |  |  |  |

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- Definition Maximum interest rate range of loan commitments with fixed interest rates. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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