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FAIR VALUE MEASUREMENTS - Estimated Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers of assets from level 1 to level 2 $ 0 $ 0
Transfers of assets from level 2 to level 1 0 0
Transfers of assets into level 3 0 0
Transfers of assets out of level 3 0 0
Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 165,782 216,304
Recurring basis | Municipal securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 39,604 23,566
Recurring basis | Agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 40,705 25,315
Recurring basis | Real estate mortgage investment conduits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 32,717 55,815
Recurring basis | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 16,945 72,248
Recurring basis | Other mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 35,811 39,360
Recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 165,782 216,304
Recurring basis | Level 2 | Municipal securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 39,604 23,566
Recurring basis | Level 2 | Agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 40,705 25,315
Recurring basis | Level 2 | Real estate mortgage investment conduits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 32,717 55,815
Recurring basis | Level 2 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis 16,945 72,248
Recurring basis | Level 2 | Other mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value on a recurring basis $ 35,811 $ 39,360