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Carver Bancorp Inc.-Parent Company Only Parent Company Only-Condensed Statements of Cash Flow (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 7,533 | $ (944) | $ (594) | $ (641) | $ (2,034) | $ (893) | $ (251) | $ 325 | $ 5,354 | $ (2,853) | $ (2,853)
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (1,173) | 1,641 |
Decrease in other liabilities |  |  |  |  |  |  |  |  | (870) | (147) |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | (4,985) | 827 |
Net decrease in cash |  |  |  |  |  |  |  |  | 75,872 | (4,502) |
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 5,354 | (2,853) |
Equity in net loss from subsidiaries |  |  |  |  |  |  |  |  | 6,097 | (2,048) |
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (51) | 54 |
Increase (decrease) in accounts payable to subsidiaries |  |  |  |  |  |  |  |  | 166 | 176 |
Decrease in other liabilities |  |  |  |  |  |  |  |  | 630 | (1,928) |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | 2 | (2,503) |
Net decrease in cash |  |  |  |  |  |  |  |  | 2 | (2,503) |
Cash and cash equivalents - beginning |  |  |  | $ 492 |  |  |  | $ 2,995 | 492 | 2,995 |
Cash and cash equivalents - end | $ 494 |  |  |  | $ 492 |  |  |  | $ 494 | $ 492 | $ 2,995

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