Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Reconciliation of factors used in computing basic and diluted earnings per common share
Net income	$ 10,618	$ 1,861	$ 11,353	$ 12,146	$ 12,479	$ 23,499
Weighted average common shares outstanding for basic earnings per common share (in shares)	59,420,592		43,202,562		59,353,759	43,155,360
Dilutive potential common shares	691,831		518,889		798,728	539,757
Shares used in computing diluted earnings per common share (in shares)	60,112,423		43,721,451		60,152,487	43,695,117
Basic earnings per share (in dollars per share)	$ 0.18		$ 0.26		$ 0.21	$ 0.54
Diluted earnings per share (in dollars per share)	$ 0.18		$ 0.26		$ 0.21	$ 0.54
Number of shares not in computing diluted earnings per common share	1,722,342		826,445		1,490,688	826,445