Stockholders' Equity - Summary of Capital Structure (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2017	Dec. 31, 2016
Class Of Stock [Line Items]
Shares authorized	50,000,000	50,000,000
Shares issued	18,223,743	18,154,365
Treasury shares	(91,158)	(76,118)
Shares outstanding	18,132,585	18,078,247
Par value per share	$ 0.01	$ 0.01
Series A Preferred Dividends
Class Of Stock [Line Items]
Shares authorized	50,000	50,000
Shares issued	45,500	45,500
Shares outstanding	45,500	45,500
Par value per share	$ 0.01	$ 0.01
Liquidation preference per share	$ 100	$ 100
Liquidation preference amount	$ 4,550	$ 4,550
Dividend rate	Prime + 2%	Prime + 2%
Dividend rate	8.00%	8.00%
Subsequent dividend payment dates	Quarterly	Quarterly
Convertible to common stock	Yes	Yes
Conversion period	Anytime	Anytime
Conversion ratio - preferred to common	6.94008	6.94008
Series B Preferred Dividends
Class Of Stock [Line Items]
Shares authorized	115,000	115,000
Shares issued	51,076	51,956
Shares outstanding	51,076	51,956
Par value per share	$ 0.01	$ 0.01
Liquidation preference per share	$ 100	$ 100
Liquidation preference amount	$ 5,108	$ 5,196
Dividend rate	8.00%	8.00%
Subsequent dividend payment dates	Quarterly	Quarterly
Convertible to common stock	Yes	Yes
Conversion period	Anytime	Anytime
Conversion ratio - preferred to common	6.94008	6.94008

Preferred stock to common stock conversion ratio.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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A unique description of a noncash or part noncash stock conversion. The description would be expected to include sufficient information to provide an understanding of the nature and purpose of the conversion. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Significant terms of contract to issue additional shares or sinking fund requirements.

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Describe the conversion features of preferred stock if preferred stock is convertible. That is, shares of preferred stock into which another convertible security was converted, or shares of preferred stock into which another class of preferred stock was converted.

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Description of basis of dividend, such as adjustable rate. Excludes percentage rate dividend payments or fixed dollar amounts per share.

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The percentage rate used to calculate dividend payments on preferred stock.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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