FAIR VALUE MEASUREMENTS - Assets Measured at Fair Value on a Non-recurring Basis (Details) - Nonrecurring basis - Impaired loans - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nonrecurring assets measured at fair value	$ 239	$ 241
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nonrecurring assets measured at fair value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nonrecurring assets measured at fair value	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nonrecurring assets measured at fair value	$ 239	$ 241