LOANS HELD FOR INVESTMENT - Financing receivables with payment default (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2024
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default	$ 0	$ 243,000
Interest Rate [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		147,000
Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		40,000
Combination Of Interest Rate Below Market Reduction And Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Principal And Or Interest Forgiveness [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Other Loan Modifications [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		56,000
Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Residential Portfolio Segment [Member] | Conventional Loan [Member] | Interest Rate [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Residential Portfolio Segment [Member] | Conventional Loan [Member] | Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Residential Portfolio Segment [Member] | Conventional Loan [Member] | Combination Of Interest Rate Below Market Reduction And Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Residential Portfolio Segment [Member] | Conventional Loan [Member] | Principal And Or Interest Forgiveness [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Residential Portfolio Segment [Member] | Conventional Loan [Member] | Other Loan Modifications [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Interest Rate [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Combination Of Interest Rate Below Market Reduction And Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Principal And Or Interest Forgiveness [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Other Loan Modifications [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Interest Rate [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Combination Of Interest Rate Below Market Reduction And Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Principal And Or Interest Forgiveness [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Other Loan Modifications [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Construction Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Construction Loans [Member] | Commercial Portfolio Segment [Member] | Interest Rate [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Construction Loans [Member] | Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Construction Loans [Member] | Commercial Portfolio Segment [Member] | Combination Of Interest Rate Below Market Reduction And Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Construction Loans [Member] | Commercial Portfolio Segment [Member] | Principal And Or Interest Forgiveness [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Construction Loans [Member] | Commercial Portfolio Segment [Member] | Other Loan Modifications [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Automobile Loan [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		65,000
Automobile Loan [Member] | Consumer Portfolio Segment [Member] | Interest Rate [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Automobile Loan [Member] | Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		9,000
Automobile Loan [Member] | Consumer Portfolio Segment [Member] | Combination Of Interest Rate Below Market Reduction And Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Automobile Loan [Member] | Consumer Portfolio Segment [Member] | Principal And Or Interest Forgiveness [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Automobile Loan [Member] | Consumer Portfolio Segment [Member] | Other Loan Modifications [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		56,000
Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Personal Loans [Member] | Consumer Portfolio Segment [Member] | Interest Rate [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Personal Loans [Member] | Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Personal Loans [Member] | Consumer Portfolio Segment [Member] | Combination Of Interest Rate Below Market Reduction And Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Personal Loans [Member] | Consumer Portfolio Segment [Member] | Principal And Or Interest Forgiveness [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Personal Loans [Member] | Consumer Portfolio Segment [Member] | Other Loan Modifications [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Credit Cards [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		147,000
Credit Cards [Member] | Consumer Portfolio Segment [Member] | Interest Rate [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		147,000
Credit Cards [Member] | Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Credit Cards [Member] | Consumer Portfolio Segment [Member] | Combination Of Interest Rate Below Market Reduction And Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Credit Cards [Member] | Consumer Portfolio Segment [Member] | Principal And Or Interest Forgiveness [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Credit Cards [Member] | Consumer Portfolio Segment [Member] | Other Loan Modifications [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		31,000
Other Loans [Member] | Consumer Portfolio Segment [Member] | Interest Rate [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Other Loans [Member] | Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		31,000
Other Loans [Member] | Consumer Portfolio Segment [Member] | Combination Of Interest Rate Below Market Reduction And Extended Maturity [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Other Loans [Member] | Consumer Portfolio Segment [Member] | Principal And Or Interest Forgiveness [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		0
Other Loans [Member] | Consumer Portfolio Segment [Member] | Other Loan Modifications [Member]
Financing Receivable Modified Subsequent Default [Line Items]
Financing receivable that had a payment default		$ 0