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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | $ 5,047,179 | $ 5,229,984
Residential Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,527,054 | 2,633,161
MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,676,144 | 2,784,779
Fair Value, Measurements, Recurring [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity securities | 4,871 | 4,893
Derivative Assets | 239 | 341
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 242 | 317
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 116,068 | 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 | 467,940 | 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 | 1,785,476 | 1,874,960
Fair Value, Measurements, Recurring [Member] | MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,676,144 | 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 | 1,551 | 1,415
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity securities | 4,871 | 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 | 116,068 | 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 2 [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity securities | 0 | 0
Derivative Assets | 239 | 341
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 242 | 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 | 467,940 | 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 | 1,785,476 | 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 | 2,671,420 | 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 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 | 4,724 | 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 | $ 1,551 | $ 1,415

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