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Fair Value, Assets Measured on Recurring Basis, Valuation Techniques (Details) $ in Thousands | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($)
Fair Value, Inputs, Level 3 |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Mortgage servicing rights |  | $ 134 | $ 147 |  |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Mortgage servicing rights |  | 134 | 147 |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Mortgage servicing rights |  | 134 | 147 |  |
Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3 |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | $ 134 | $ 147 | $ 142 | $ 145
Fair Value Measurements, Valuation Processes, Description |  | Discounted Cash Flow | Discounted Cash Flow |  |
Servicing Asset, Measurement Input |  | 0.1281 | 0.1333 |  |
Measurement Input, Constant Prepayment Rate | Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3 |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Fair Value Measurements, Valuation Processes, Description | [1] | Weighted Average Constant Prepayment Rate (1) | Weighted Average Constant Prepayment Rate (1) |  |
Measurement Input, Discount Rate | Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3 |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Fair Value Measurements, Valuation Processes, Description | [1] | Option Adjusted Spread ("OAS") applied to Treasury curve | Option Adjusted Spread ("OAS" applied to Treasury curve |  |
[1] | (1) Represents annualized loan repayment rate assumptions

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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