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Stockholders' Equity (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 shares | Nov. 30, 2011 investor | Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares | Dec. 31, 2015 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |
Number of institutional investors that purchased warrant | investor |  | 2 |  |  |
Cash dividends to common stockholders | $ |  |  | $ 1,518 | $ 1,307 | $ 5,390
Cash dividends paid per common share | $ / shares |  |  | $ 0.25 | $ 0.22 |
Net issuance of shares of common stock from cashless exercise |  |  |  |  | 0
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% |  |
Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of common stock shares authorized to be purchased by warrant |  |  | 157,711 |  |
Exercise price of warrant to purchase common stock (usd per share) | $ / shares |  |  | $ 26.63 |  |
Net issuance of shares of common stock from cashless exercise | 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 |  |  | 154,242 |  |
Exercise price of warrant to purchase common stock (usd per share) | $ / shares |  |  | $ 27.23 |  |

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