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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | $ 6,081,120 | $ 6,453,761
Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 3,517,827 | 4,044,443
Fair Value, Measurements, Recurring [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI | 5,082 | 5,378
Derivative Assets | 1,025 | 1,505
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 636 | 1,178
Fair Value, Measurements, Recurring [Member] | Other Available For Sale Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 1,000 | 1,000
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 141,347 | 148,486
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 3,517,827 | 4,044,443
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Noncallable [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 258,663 | 285,028
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Call Option [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 2,159,474 | 1,971,954
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 2,809 | 2,850
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI | 5,082 | 5,378
Derivative Assets | 0 | 0
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Other Available For Sale 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] | U S Treasury Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 141,347 | 148,486
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Mortgage Backed 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] | 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] | 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] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI | 0 | 0
Derivative Assets | 1,025 | 1,505
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 636 | 1,178
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Other Available For Sale 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] | 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] | Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 3,511,456 | 4,037,209
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 | 258,663 | 285,028
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 | 2,159,474 | 1,971,954
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 3 [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI | 0 | 0
Derivative Assets | 0 | 0
Derivative Liabilities [Abstract] |  |
Derivative Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Other Available For Sale Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 1,000 | 1,000
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] | Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 6,371 | 7,234
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] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | $ 2,809 | $ 2,850

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