Basis of presentation (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Summary of Basic and Diluted Earnings Per Common Share

The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented:

	Year Ended December 31,
	2019			2018			2017
Basic earnings per common share calculation:
Net income	$	83,814		$	80,236		$	52,398
Dividends paid on and undistributed earnings allocated to participating securities	(447		)	(428		)	—
Earnings attributable to common shareholders	$	83,367		$	79,808		$	52,398
Weighted-average basic shares outstanding	30,870,474			30,675,755			27,627,228
Basic earnings per common share	$	2.70		$	2.60		$	1.90
Diluted earnings per common share:
Earnings attributable to common shareholders	83,367			79,808			52,398
Weighted-average basic shares outstanding	30,870,474			30,675,755			27,627,228
Weighted-average diluted shares contingently issuable	532,423			639,226			580,374
Weighted-average diluted shares outstanding	31,402,897			31,314,981			28,207,602
Diluted earnings per common share	$	2.65		$	2.55		$	1.86