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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | $ 4,957,311 | $ 5,229,984
MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,602,279 | 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 | 4,867 | 4,893
Derivative Assets | 316 | 341
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 152 | 317
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 117,073 | 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 | 495,689 | 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 | 1,739,738 | 1,874,960
Fair Value, Measurements, Recurring [Member] | MBS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,602,279 | 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 | 1,532 | 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 | 4,867 | 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 | 117,073 | 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 | 316 | 341
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 152 | 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 | 495,689 | 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 | 1,739,738 | 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 | 2,597,712 | 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 | 4,567 | 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 | 1,532 | 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

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