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Stockholders' Equity (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 21, 2016 $ / shares | Sep. 30, 2015 $ / shares shares | Nov. 30, 2011 investor | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of institutional investors that purchased warrant | investor |  |  | 2 |  |  |  |  |
Cash dividends to common stockholders | $ |  |  |  | $ 1,528 | $ 1,316 | $ 4,573 | $ 3,936 | $ 5,390
Cash dividends paid per common share (usd per share) |  |  |  | $ 0.25 | $ 0.22 | $ 0.75 | $ 0.66 |
Performance-based stock awards |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Vesting period of performance-based stock awards |  |  |  |  |  | 3 years |  |
Performance-based stock awards | Minimum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Vesting percentage of performance-based awards |  |  |  |  |  | 0.00% |  |
Performance-based stock awards | Maximum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Vesting percentage of performance-based awards |  |  |  |  |  | 200.00% |  |
Subsequent event |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends declared per common share (usd per share) | $ 0.27 |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of common stock shares authorized to be purchased by warrant (in shares) | shares |  | 157,711 |  |  | 157,711 |  | 157,711 |
Exercise price of warrant to purchase common stock (usd per share) |  | $ 26.63 |  |  | $ 26.63 |  | $ 26.63 |
Net issuance of shares of common stock from cashless exercise (in shares) | shares |  | 70,591 |  |  |  |  |  |
U.S. Treasury Capital Purchase Program (TCPP) | Common stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of common stock shares authorized to be purchased by warrant (in shares) | shares |  | 154,242 |  |  | 154,242 |  | 154,242 |
Exercise price of warrant to purchase common stock (usd per share) |  | $ 27.23 |  |  | $ 27.23 |  | $ 27.23 |

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