Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 7,939	$ 25,044
Weighted average common shares outstanding (in shares)	105,882,553	103,101,789
Dilutive potential shares due to effect of stock options (in shares)	265,694	1,394,803
Total weighted average common shares and dilutive potential shares (in shares)	106,148,247	104,496,592
Basic earnings per share (in dollars per share)	$ 0.08	$ 0.24
Diluted earnings per share (in dollars per share)	$ 0.07	$ 0.24