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Loans Receivable and ALLL (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans Receivable, before Fees, Gross |  | $ 465,815 |  | $ 425,172 |  |  |
Unamortized premiums, deferred costs and fees, net |  | 2,778 |  | 3,560 |  |  |
Allowance for loan losses |  | (5,138) | $ (4,916) | (4,946) | $ (4,607) | $ (4,625) | $ (4,646)
Total loans receivable, net |  | $ 463,455 |  | $ 423,786 |  |  |
Percentage of Loan Type |  | 100.00% |  | 100.00% |  |  |
Other Real Estate Owned |  | $ 60 |  | $ 120 |  |  |
Financing Receivable, Troubled Debt Restructuring |  | 7,600 |  | 3,900 |  |  |
One-to-four family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans Receivable, before Fees, Gross |  | 81,678 |  | 105,532 |  |  |
Allowance for loan losses |  | $ (864) | (953) | $ (1,055) | (1,181) | (1,289) | (1,274)
Percentage of Loan Type |  | 17.50% |  | 24.80% |  |  |
Multifamily |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans Receivable, before Fees, Gross |  | $ 107,089 |  | $ 89,241 |  |  |
Allowance for loan losses |  | $ (1,027) | (960) | $ (1,011) | (920) | (884) | (885)
Percentage of Loan Type |  | 23.00% |  | 21.00% |  |  |
Commercial real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans Receivable, before Fees, Gross |  | $ 146,742 |  | $ 141,761 |  |  |
Allowance for loan losses |  | $ (966) | (969) | $ (812) | (691) | (695) | (766)
Percentage of Loan Type |  | 31.50% |  | 33.30% |  |  |
Business |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans Receivable, before Fees, Gross | [1] | $ 127,579 |  | $ 85,425 |  |  |
Allowance for loan losses |  | $ (1,838) | (1,636) | $ (1,567) | (1,484) | (1,491) | (1,330)
Percentage of Loan Type | [1] | 27.40% |  | 20.10% |  |  |
Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans Receivable, before Fees, Gross | [2] | $ 2,727 |  | $ 3,213 |  |  |
Allowance for loan losses |  | $ (190) | $ (189) | $ (212) | $ (231) | $ (248) | $ (154)
Percentage of Loan Type | [2] | 0.60% |  | 0.80% |  |  |
[1] | (1) Includes PPP loans and business overdrafts
[2] | 2) Includes personal loans and consumer overdrafts

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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