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Stockholders' Equity - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 26, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2016 | Jul. 27, 2021 | Dec. 10, 2020
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid |  |  |  |  |  |  | $ 587,000 | $ 587,000 |  |  |
Aggregate number of shares authorized to repurchase |  |  |  |  |  |  |  |  |  | 1,250,000 | 1,250,000
Approximate percentage of shares authorized to be repurchased |  | 3.00% |  |  |  |  | 3.00% |  |  |  |
Number of shares purchased |  | 460,220 |  |  |  |  | 1,331,708 |  |  |  |
Value of shares purchased |  | $ 10,411,000 | $ 12,093,000 | $ 6,363,000 |  | $ 1,668,000 | $ 28,900,000 |  |  |  |
Common stock, cash dividends paid |  | $ 0.09 |  |  | $ 0.03 |  | $ 0.21 | $ 0.09 |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  | 7.50% |  |
Preferred stock fixed dividend close date |  |  |  |  |  |  |  |  | Dec. 30, 2021 |  |
Dividends declared and paid |  | $ 196,000 |  |  | $ 196,000 |  | $ 587,000 | $ 587,000 |  |  |
Series B Preferred Stock | Three-month LIBOR |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  | 5.41% |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared | $ 0.09 |  |  |  |  |  |  |  |  |  |
Dividend payable date | Nov. 23, 2021 |  |  |  |  |  |  |  |  |  |
Dividends record date | Nov. 09, 2021 |  |  |  |  |  |  |  |  |  |
Cash dividend declared | $ 0.09 |  |  |  |  |  |  |  |  |  |

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