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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic
Net income available to common shareholders	$ 17,394	$ 15,138	$ 50,037	$ 44,222
Less: Income attributable to unvested stock-based compensation awards	(266)	(219)	(792)	(677)
Net earnings allocated to common shareholders	$ 17,128	$ 14,919	$ 49,245	$ 43,545
Weighted average shares outstanding, including unvested stock-based compensation awards (in shares)	15,197,180	15,047,113	15,178,039	15,025,776
Less: unvested stock-based compensation awards (in shares)	(230,949)	(217,891)	(240,478)	(229,693)
Weighted average shares outstanding - Basic (in shares)	14,966,231	14,829,222	14,937,561	14,796,083
Diluted
Net earnings allocated to common shareholders	$ 17,128	$ 14,919	$ 49,245	$ 43,545
Weighted average shares outstanding - Basic (in shares)	14,966,231	14,829,222	14,937,561	14,796,083
Plus: Incremental shares from assumed conversion of stock-based compensation awards (in shares)	112,324	136,011	125,309	114,014
Weighted average shares outstanding - Diluted (in shares)	15,078,555	14,965,233	15,062,870	14,910,097
Basic EPS (in dollars per share)	$ 1.14	$ 1.01	$ 3.30	$ 2.94
Diluted EPS (in dollars per share)	$ 1.14	$ 1.00	$ 3.27	$ 2.92
Antidilutive securities excluded from computation of earning per share (in shares)	21,804	0	21,126	15,994

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The aggregate value of income of unvested stock-based compensation awards necessary to derive net income apportioned to common stockholders.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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