Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Allowance for credit losses	$ 20,306	$ 19,380
Common shares, shares issued	260,526,784	262,899,174
Common shares, shares outstanding	260,453,918	262,824,990
Treasury shares	72,866	74,184