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Carver Bancorp Inc.- Parent Company Only-Condensed Statements of Cash Flow (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 1994 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2022 | Mar. 31, 2003
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |
Net loss |  | $ (13,744) | $ (2,977) |  |
Restricted stock vesting |  | 66 | 220 |  |
Increase (Decrease) in Other Assets |  | (1,094) | (82) |  |
Increase (Decrease) in Other Liabilities |  | (952) | (3,054) |  |
Net cash (used in) provided by operating activities |  | (12,609) | (6,571) |  |
Payments to Acquire Other Investments |  | 0 | (603) |  |
Net cash used in investing activities |  | 15,079 | (20,053) |  |
Proceeds from Issuance of Long-term Debt |  | 1,814 | 5,527 |  | $ 13,000
Proceeds from Issuance of Common Stock | $ 21,500 | 195 | 1,000 | $ 3,000 |
Net cash provided by financing activities |  | (11,180) | 43,097 |  |
Net increase (decrease) in cash and cash equivalents |  | (8,710) | 16,473 |  |
Parent Company |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |
Net loss |  | (13,744) | (2,977) |  |
Equity in net loss from subsidiaries |  | (9,888) | (457) |  |
Restricted stock vesting |  | 66 | 219 |  |
Increase (Decrease) in Other Assets |  | 96 | (59) |  |
Increase (decrease) in accounts payable to subsidiaries |  | 2,431 | 1,825 |  |
Increase (Decrease) in Other Liabilities |  | 229 | (488) |  |
Net cash (used in) provided by operating activities |  | (1,034) | (1,023) |  |
Capital contribution |  | (1,000) | 0 |  |
Proceeds from Equity Method Investment, Distribution, Return of Capital |  | (189) |  |  |
Payments to Acquire Other Investments |  |  | (658) |  |
Net cash used in investing activities |  | (811) | (658) |  |
Proceeds from Issuance of Long-term Debt |  | 0 | 2,500 |  |
Proceeds from Issuance of Common Stock |  | 195 | 1,000 |  |
Net cash provided by financing activities |  | 195 | 3,500 |  |
Net increase (decrease) in cash and cash equivalents |  | (1,650) | 1,819 |  |
Cash and cash equivalents - beginning |  | 2,487 | 668 |  |
Cash and cash equivalents - end |  | $ 837 | $ 2,487 |  |

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