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LOANS RECEIVABLE - Loans receivable, excluding loans held for sale (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 975,174		$ 911,509
Less: Allowance for loan losses		18,866	$ 17,076	12,624	$ 11,436	$ 11,442	$ 11,457
Loans receivable, net		956,308		898,885
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		900,364		824,143
Commercial Real Estate Portfolio Segment | Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	281,670		179,029
Less: Allowance for loan losses		2,180	2,011	2,008	2,051	2,113	1,808
Commercial Real Estate Portfolio Segment | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		525,977		507,871
Less: Allowance for loan losses		13,209	11,323	6,421	5,038	4,889	5,053
Commercial Real Estate Portfolio Segment | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		14,531		14,026
Less: Allowance for loan losses		245	243	230	219	244	254
Commercial Real Estate Portfolio Segment | Multi-Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		49,878		58,374
Less: Allowance for loan losses		745	879	854	779	699	728
Commercial Real Estate Portfolio Segment | Real Estate Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		28,308		64,843
Less: Allowance for loan losses		720	692	1,149	1,381	1,506	1,457
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		74,810		87,366
Less: Allowance for loan losses		1,155	$ 1,281	1,363	$ 1,347	$ 1,346	$ 1,447
Consumer | Real estate one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		71,940		83,150
Consumer | Other installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 2,870		$ 4,216
[1] SBA PPP loans totaled $110.8 million and none at September 30, 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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