Earnings per Share (Computation of Basic and Diluted Earnings Per Share) (Details) $ / shares in Units, $ in Thousands		3 Months Ended																9 Months Ended	12 Months Ended
		Dec. 31, 2016 USD ($) $ / shares		Sep. 30, 2016 USD ($) $ / shares		Jun. 30, 2016 USD ($) $ / shares		Mar. 31, 2016 USD ($) $ / shares	[1]	Dec. 31, 2015 USD ($) $ / shares	[2]	Sep. 30, 2015 USD ($) $ / shares		Jun. 30, 2015 USD ($) $ / shares		Mar. 31, 2015 USD ($) $ / shares		Sep. 30, 2016	Dec. 31, 2016 USD ($) $ / shares shares		Dec. 31, 2015 USD ($) $ / shares shares		Dec. 31, 2014 USD ($) $ / shares shares
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income | $		$ 10,902		$ 10,903		$ 9,616		$ 8,646		$ 1,692		$ 6,456		$ 7,193		$ 5,611			$ 40,067		$ 20,952		$ 24,570
Dividends and undistributed earnings allocated to participating securities | $	[3]																		(189)		(59)		(75)
Net income available to common shareholders | $																			$ 39,878		$ 20,893		$ 24,495
Weighted-average common shares outstanding for basic EPS(2)	[4]																		15,422,160		12,031,294		11,176,468
Dilutive effect of stock-based awards	[4],[5]																		82,079		43,285		29,420
Weighted-average common and potential common shares for diluted EPS(2)	[4]																		15,504,239		12,074,579		11,205,888
Basic EPS | $ / shares		$ 0.70	[1],[2],[6]	$ 0.70	[1],[2],[6]	$ 0.62	[1],[2],[6]	$ 0.56	[2],[6]	$ 0.11	[1],[6]	$ 0.58	[1],[2],[6]	$ 0.64	[1],[2],[6]	$ 0.50	[1],[2],[6]		$ 2.59	[4]	$ 1.73	[4]	$ 2.19	[4]
Diluted EPS | $ / shares		$ 0.70	[1],[2],[6]	$ 0.70	[1],[2],[6]	$ 0.62	[1],[2],[6]	$ 0.56	[2],[6]	$ 0.11	[1],[6]	$ 0.57	[1],[2],[6]	$ 0.64	[1],[2],[6]	$ 0.50	[1],[2],[6]		$ 2.57	[4]	$ 1.73	[4]	$ 2.19	[4]
Shares that were not considered in computation of potential common shares for purposes of diluted EPS	[4],[7]																		0		19,875		20,625
Stockholders' Equity Note, Stock Split, Conversion Ratio																		1.5	1.5

[1] (1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.

[2] On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition

[3] Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends.

[4] (2)Share and per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.

[5] Represents the effect of the assumed exercise of stock options, vesting of restricted shares, vesting of restricted stock units, and vesting of LTIP awards that have met the performance criteria, utilizing the treasury stock method.

[6] (3)Earnings per share amounts have been adjusted to reflect the three-for-two split effective September 30, 2016, for all periods presented. Refer to Note 13.

[7] Represents stock-based awards not included in the computation of potential common shares for purposes of calculating diluted EPS as the exercise prices were greater than the average market price of the Company's common stock, and, therefore, are considered anti-dilutive.