FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	$ 6,453,761	$ 4,647,019
Fair Value, Measurements, Recurring [Member]
Assets Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	5,378	1,474
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	1,098	1,622
Derivative Liabilities [Abstract]
Derivative Liabilities	1,092	1,639
Fair Value, Measurements, Recurring [Member] | Other Available For Sale Securities [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	1,000	650
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	148,486	7,507
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Noncallable [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	285,028	173,371
Fair Value, Measurements, Recurring [Member] | Government Agencies Debt Securities [Member] | Call Option [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	6,009,163	4,454,164
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,850	2,899
Fair Value, Measurements, Recurring [Member] | Private label [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	7,234	8,428
Fair Value, Measurements, Recurring [Member] | Interest Rate Cap [Member] | Purchase [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	8	1
Fair Value, Measurements, Recurring [Member] | Interest Rate Cap [Member] | Written [Member]
Derivative Liabilities [Abstract]
Derivative Liabilities	8	1
Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	0	102
Derivative Liabilities [Abstract]
Derivative Liabilities	78	280
Fair Value, Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	379	737
Fair Value, Measurements, Recurring [Member] | Forward loan sales commitments [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	20	20
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member]
Assets Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	5,378	1,474
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Interest Rate Swap [Member]
Assets Fair Value Disclosure [Abstract]
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	148,486	7,507
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 1 [Member] | Private label [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Interest Rate Cap [Member] | Purchase [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Interest Rate Cap [Member] | Written [Member]
Derivative Liabilities [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Forward Contracts [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Derivative Liabilities [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Interest Rate Lock Commitments [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Forward loan sales commitments [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member]
Assets Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Swap [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	1,098	1,622
Derivative Liabilities [Abstract]
Derivative Liabilities	1,092	1,639
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] | Government Agencies Debt Securities [Member] | Noncallable [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	285,028	173,371
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	6,009,163	4,454,164
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 2 [Member] | Private label [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Purchase [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	8	1
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Written [Member]
Derivative Liabilities [Abstract]
Derivative Liabilities	8	1
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Forward Contracts [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	0	102
Derivative Liabilities [Abstract]
Derivative Liabilities	78	280
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Lock Commitments [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	379	737
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Forward loan sales commitments [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	20	20
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member]
Assets Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Interest Rate Swap [Member]
Assets Fair Value Disclosure [Abstract]
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	650
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] | 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	2,850	2,899
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label [Member]
Assets Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	7,234	8,428
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Interest Rate Cap [Member] | Purchase [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Interest Rate Cap [Member] | Written [Member]
Derivative Liabilities [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Forward Contracts [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Derivative Liabilities [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Interest Rate Lock Commitments [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Forward loan sales commitments [Member]
Assets Fair Value Disclosure [Abstract]
Derivative Assets	$ 0	$ 0