Investment Securities - Additional Information (Details) - USD ($) |
6 Months Ended | ||
|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Mar. 31, 2026 |
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| Debt Securities, Available-for-Sale [Line Items] | |||
| Investment securities, Amortized cost | $ 70,993,000 | $ 65,957,000 | |
| Available for sale, Fair Value | 65,434,000 | 62,534,000 | |
| Sales of available-for-sale securities | 0 | $ 0 | |
| Credit losses on debt securities | 0 | ||
| Provision for credit losses on securities | 0 | ||
| Gain (loss) on sale/call of investment securities | (226,000) | ||
| Allowance for credit losses | 0 | ||
| Investment securities - held to maturity | 3,150,000 | 175,000 | |
| Proceeds received available for sale security | 1,100,000 | ||
| Sales of securities held to maturity | 0 | $ 0 | |
| Public, Consumer, and Commercial Deposits | |||
| Debt Securities, Available-for-Sale [Line Items] | |||
| Investment securities, Amortized cost | 26,000,000 | 22,500,000 | |
| Available for sale, Fair Value | 23,600,000 | $ 21,200,000 | |
| Bank Subordinated Debt | |||
| Debt Securities, Available-for-Sale [Line Items] | |||
| Investment securities - held to maturity | $ 3,000,000 | ||
| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of expense (reversal of expense) for allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of realized and unrealized gain (loss) on investment. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The cash inflow associated with the sale of securities that had been designated as held-to-maturity. Excludes proceeds from maturities, prepayments and calls by the issuer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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