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Stockholders' Equity (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 07, 2017 | Jul. 17, 2017 | Jun. 14, 2017 | Jun. 06, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | May 05, 2017 | May 04, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares tendered and not properly withdrawn (in shares) |  |  |  | 2,858,425 |  |  |  |  |  |  |
Tendered shares as percent of shares outstanding |  |  |  |  |  |  |  |  |  |  | 6.20%
Dividends declared (in dollars per share) |  |  | $ 0.25 |  | $ 0.25 | $ 0 | $ 0.25 | $ 0 |  |  |
Dividends payable |  |  |  |  | $ 5,268,000 |  | $ 5,268,000 |  | $ 0 |  |
Net operating losses and tax credits |  |  |  |  |  |  |  |  | $ 113,000,000 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.25 |  |  |  |  |  |  |  |  |  |
Dividends paid |  | $ 5,200,000 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares acquired (in shares) |  |  |  | 1,370,891 |  |  |  |  |  |  |
Cost per share (in dollars per shares) |  |  |  | $ 9.40 |  |  |  |  |  |  |
Treasury stock acquired |  |  |  | $ 12,900,000 |  |  |  |  |  |  |
Additional tendered shares acquires (in shares) |  |  |  | 445,891 |  |  |  |  |  |  |
Common Stock | Manager of a Financial Institution |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares acquired (in shares) |  |  |  | 70,178 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  |  | 925,000 |
Share price (in dollars per shares) |  |  |  |  |  |  |  |  |  | $ 10.8 |
Authorized amount |  |  |  |  |  |  |  |  |  | $ 9,990,000 |
Additional authorized amount (percent) |  |  |  |  |  |  |  |  |  | 2.00% |
Requirement to own shares outstanding as percent |  |  |  | 4.99% |  |  |  |  |  |  |
Maximum | Manager of a Financial Institution |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requirement to own shares outstanding as percent |  |  |  | 4.99% |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per shares) |  |  |  |  |  |  |  |  |  | $ 9.4 |

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