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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities $ 4,496,803 $ 4,565,302
MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 2,739,086 2,663,162
Fair Value, Measurements, Recurring [Member]    
Assets Fair Value Disclosure [Abstract]    
Equity securities 4,971 4,886
Derivative Assets 298 318
Derivative Liabilities [Abstract]    
Derivative Liabilities 324 150
Fair Value, Measurements, Recurring [Member] | U.S. Treasury securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 217,432 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 548,336 533,296
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 989,873 1,307,035
Fair Value, Measurements, Recurring [Member] | MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 2,739,086 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 1,576 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 4,971 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 217,432 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 298 318
Derivative Liabilities [Abstract]    
Derivative Liabilities 324 150
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 548,336 533,296
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 989,873 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 2,735,305 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 3,781 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 1,576 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