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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale $ 5,433,369 $ 5,599,520
Residential Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 2,759,697 2,941,458
MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 2,916,161 3,104,591
Fair Value, Measurements, Recurring [Member]    
Assets Fair Value Disclosure [Abstract]    
Equity securities 4,891 4,861
Derivative Assets 494 633
Derivative Liabilities [Abstract]    
Derivative Liabilities 357 476
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 139,669 138,875
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Noncallable [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 475,295 389,787
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Call Option [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 1,900,133 1,963,566
Fair Value, Measurements, Recurring [Member] | MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 2,916,161 3,104,591
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 2,111 2,201
Fair Value, Measurements, Recurring [Member] | Other Debt Obligations [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 0 500
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member]    
Assets Fair Value Disclosure [Abstract]    
Equity securities 4,891 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]    
Debt Securities, Available-for-sale 139,669 138,875
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Government Agencies Debt Securities [Member] | Noncallable [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 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]    
Debt Securities, Available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 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]    
Debt Securities, Available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Other Debt Obligations [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member]    
Assets Fair Value Disclosure [Abstract]    
Equity securities 0 0
Derivative Assets 494 633
Derivative Liabilities [Abstract]    
Derivative Liabilities 357 476
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | U S Treasury Securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 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]    
Debt Securities, Available-for-sale 475,295 389,787
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Government Agencies Debt Securities [Member] | Call Option [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 1,900,133 1,963,566
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 2,910,915 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]    
Debt Securities, Available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Other Debt Obligations [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 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]    
Debt Securities, Available-for-sale 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]    
Debt Securities, Available-for-sale 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]    
Debt Securities, Available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | MBS [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale 5,246 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]    
Debt Securities, Available-for-sale 2,111 2,201
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Other Debt Obligations [Member]    
Assets Fair Value Disclosure [Abstract]    
Debt Securities, Available-for-sale $ 0 $ 500