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Carver Bancorp Inc.-Parent Company Only Parent Company Only-Condensed Statements of Operations (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 Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense on borrowings |  |  |  |  |  |  |  |  | $ 1,174 | $ 1,257 |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 12,615 | 12,462 |
Other |  |  |  |  |  |  |  |  | 7,660 | 8,985 |
Net income (loss) | $ 7,533 | $ (944) | $ (594) | $ (641) | $ (2,034) | $ (893) | $ (251) | $ 325 | 5,354 | (2,853) | $ (2,853)
Comprehensive loss |  |  |  |  |  |  |  |  | 4,568 | (4,486) |
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in net loss from subsidiaries |  |  |  |  |  |  |  |  | 6,097 | (2,048) |
Other income |  |  |  |  |  |  |  |  | 20 | 26 |
Total income |  |  |  |  |  |  |  |  | 6,117 | (2,022) |
Interest expense on borrowings |  |  |  |  |  |  |  |  | 624 | 568 |
Shareholder expense |  |  |  |  |  |  |  |  | 49 | 82 |
Other |  |  |  |  |  |  |  |  | 90 | 181 |
Total expense |  |  |  |  |  |  |  |  | 763 | 831 |
Net income (loss) |  |  |  |  |  |  |  |  | $ 5,354 | $ (2,853) |

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