Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Reconciliation of factors used in computing basic and diluted earnings per common share
Net income	$ 11,197	$ 10,618	$ 1,861	$ 11,277	$ 11,353	$ 12,146	$ 23,676	$ 34,776
Weighted average common shares outstanding for basic earnings per common share (in shares)	59,589,243			43,258,983			59,432,178	43,189,710
Dilutive potential common shares	552,169			537,921			711,585	538,375
Shares used in computing diluted earnings per common share (in shares)	60,141,412			43,796,904			60,143,763	43,728,085
Basic earnings per share (in dollars per share)	$ 0.19			$ 0.26			$ 0.40	$ 0.81
Diluted earnings per share (in dollars per share)	$ 0.19			$ 0.26			$ 0.39	$ 0.80
Number of shares not in computing diluted earnings per common share	1,741,568			826,036			1,507,437	826,036