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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | $ 4,598,303 | $ 4,565,302
MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,840,007 | 2,663,162
Fair Value, Measurements, Recurring [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity securities | 5,009 | 4,886
Derivative Assets | 332 | 318
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 264 | 150
Fair Value, Measurements, Recurring [Member] | U.S. Treasury securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 496,803 | 59,189
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies Debt Securities [Member] | Noncallable [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 646,783 | 533,296
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies Debt Securities [Member] | Call Option [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 612,631 | 1,307,035
Fair Value, Measurements, Recurring [Member] | MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,840,007 | 2,663,162
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 1,579 | 1,620
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 500 | 1,000
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity securities | 5,009 | 4,886
Derivative Assets | 0 | 0
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | U.S. Treasury securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 496,803 | 59,189
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | U.S. Government Agencies Debt Securities [Member] | Noncallable [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | U.S. Government Agencies Debt Securities [Member] | Call Option [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Other Investments [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity securities | 0 | 0
Derivative Assets | 332 | 318
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 264 | 150
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | U.S. Treasury securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | U.S. Government Agencies Debt Securities [Member] | Noncallable [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 646,783 | 533,296
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | U.S. Government Agencies Debt Securities [Member] | Call Option [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 612,631 | 1,307,035
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,836,675 | 2,658,967
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Other Investments [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity securities | 0 | 0
Derivative Assets | 0 | 0
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | U.S. Treasury securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | U.S. Government Agencies Debt Securities [Member] | Noncallable [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | U.S. Government Agencies Debt Securities [Member] | Call Option [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 3,332 | 4,195
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 1,579 | 1,620
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Other Investments [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | $ 500 | $ 1,000

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