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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	$ 5,668,689	$ 6,453,761
Mortgage Backed Securities [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,191,719	4,044,443
Fair Value, Measurements, Recurring [Member]
Assets Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	4,924	5,378
Derivative Assets	1,212	1,505
Derivative Liabilities [Abstract]
Derivative Liabilities	452	1,178
Fair Value, Measurements, Recurring [Member] | Other Available For Sale Securities [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	500	1,000
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	138,258	148,486
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,191,719	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	249,798	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	2,086,221	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	2,193	2,850
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member]
Assets Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	4,924	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	138,258	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	1,212	1,505
Derivative Liabilities [Abstract]
Derivative Liabilities	452	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	3,185,549	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	249,798	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	2,086,221	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	500	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	6,170	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	$ 2,193	$ 2,850

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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