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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities $ 4,894,781 $ 5,229,984
MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 2,630,437 2,784,779
Other Investments [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 1,000  
Fair Value, Measurements, Recurring [Member]    
Assets Fair Value Disclosure [Abstract]    
Equity securities 5,012 4,893
Derivative Assets 322 341
Derivative Liabilities [Abstract]    
Derivative Liabilities 392 317
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 98,612 135,393
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Noncallable [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 700,299 433,437
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Call Option [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 1,462,866 1,874,960
Fair Value, Measurements, Recurring [Member] | MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 2,630,437 2,784,779
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 1,567 1,415
Fair Value, Measurements, Recurring [Member] | Other Investments [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 1,000 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member]    
Assets Fair Value Disclosure [Abstract]    
Equity securities 5,012 4,893
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 98,612 135,393
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | 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] | 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 322 341
Derivative Liabilities [Abstract]    
Derivative Liabilities 392 317
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] | Government Agencies Debt Securities [Member] | Noncallable [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 700,299 433,437
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Government Agencies Debt Securities [Member] | Call Option [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 1,462,866 1,874,960
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 2,626,116 2,779,994
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] | 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] | 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 4,321 4,785
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 1,567 1,415
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 $ 1,000 $ 0