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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | $ 5,175,803 | $ 5,599,520
Residential Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,580,395 | 2,941,458
MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,726,042 | 3,104,591
Fair Value, Measurements, Recurring [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity securities | 4,775 | 4,861
Derivative Assets | 360 | 633
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 170 | 476
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 140,723 | 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 | 430,515 | 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 | 1,877,075 | 1,963,566
Fair Value, Measurements, Recurring [Member] | MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,726,042 | 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 | 1,448 | 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 | 4,775 | 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 | 140,723 | 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 | 360 | 633
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 170 | 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 | 430,515 | 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 | 1,877,075 | 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 | 2,721,124 | 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 | 4,918 | 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 | 1,448 | 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

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