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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities $ 5,229,984 $ 5,599,520
Residential Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 2,633,161 2,941,458
MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 2,784,779 3,104,591
Fair Value, Measurements, Recurring [Member]    
Assets Fair Value Disclosure [Abstract]    
Equity securities 4,893 4,861
Derivative Assets 341 633
Derivative Liabilities [Abstract]    
Derivative Liabilities 317 476
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 135,393 138,875
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Noncallable [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 433,437 389,787
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Call Option [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 1,874,960 1,963,566
Fair Value, Measurements, Recurring [Member] | MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 2,784,779 3,104,591
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 1,415 2,201
Fair Value, Measurements, Recurring [Member] | Other Debt Obligations [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 0 500
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member]    
Assets Fair Value Disclosure [Abstract]    
Equity securities 4,893 4,861
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 135,393 138,875
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 Debt Obligations [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 341 633
Derivative Liabilities [Abstract]    
Derivative Liabilities 317 476
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 433,437 389,787
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 1,874,960 1,963,566
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities 2,779,994 3,098,797
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 Debt Obligations [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 4,785 5,794
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 1,415 2,201
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Other Debt Obligations [Member]    
Assets Fair Value Disclosure [Abstract]    
Available-For-Sale Securities, Debt Securities $ 0 $ 500