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LOANS RECEIVABLE - Loans receivable, excluding loans held for sale (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 931,468		$ 911,509
Less: Allowance for loan losses		19,192	$ 18,866	12,624	$ 11,433	$ 11,436	$ 11,457
Loans receivable, net		912,276		898,885
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		865,318		824,143
Commercial Real Estate Portfolio Segment | Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	252,687		179,029
Less: Allowance for loan losses		2,466	2,180	2,008	2,051	2,051	1,808
Commercial Real Estate Portfolio Segment | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		541,417		507,871
Less: Allowance for loan losses		13,722	13,209	6,421	5,018	5,038	5,053
Commercial Real Estate Portfolio Segment | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		12,126		14,026
Less: Allowance for loan losses		202	245	230	235	219	254
Commercial Real Estate Portfolio Segment | Multi-Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		42,166		58,374
Less: Allowance for loan losses		624	745	854	765	779	728
Commercial Real Estate Portfolio Segment | Real Estate Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		16,922		64,843
Less: Allowance for loan losses		522	720	1,149	1,467	1,381	1,457
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		66,150		87,366
Less: Allowance for loan losses		1,012	$ 1,155	1,363	$ 1,268	$ 1,347	$ 1,447
Consumer | Real estate one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		63,621		83,150
Consumer | Other installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 2,529		$ 4,216
[1] SBA PPP loans totaled $80.8 million and none at December 31, 2020 and March 31, 2020, respectively.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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