NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for loan and lease losses (Detail)	12 Months Ended
	Dec. 31, 2020
Residential Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable Threshold Period Collateral Dependent	180 days
FL | Maximum [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Forecast Period	P5Y
Reversion Period	P5Y
FL | Residential Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans Receivable With Hybrid Ajustable Rate	56.00%
PR And VI [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Forecast Period	P2Y
PR And VI [Member] | Maximum [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Reversion Period	P3Y
Home Equity Lines [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable Threshold Period Collateral Dependent	180 days