Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Basic earnings per common share
Net income	$ 4,192us-gaap_NetIncomeLoss	$ 3,337us-gaap_NetIncomeLoss
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	73	72
Basic earnings allocated to common shareholders	4,119	3,265
Weighted-average common shares outstanding, excluding participating securities	4,260,249	3,859,503
Basic earnings per common share	$ 0.97us-gaap_EarningsPerShareBasic	$ 0.85us-gaap_EarningsPerShareBasic
Diluted earnings per common share
Earnings allocated to common shareholders	4,119	3,265
Reallocation of undistributed earnings	0us-gaap_UndistributedEarningsDiluted	0us-gaap_UndistributedEarningsDiluted
Diluted earnings allocated to common shareholders	$ 4,119	$ 3,265
Weighted-average common shares outstanding, excluding participating securities	4,260,249	3,859,503
Dilutive effect of share-based awards	2,265	21,058
Weighted-average diluted common shares outstanding, excluding participating securities	4,262,514	3,880,561
Diluted earnings per common share	$ 0.97us-gaap_EarningsPerShareDiluted	$ 0.84us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. Includes the adjustments resulting from the assumption that dilutive securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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