Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement Of Financial Position [Abstract]
Allowance for credit losses	$ 34,196	$ 28,511
Common stock, no par value	$ 0	$ 0
Common shares, shares authorized	40,000,000	40,000,000
Common stock, shares issued	19,276,857	19,231,061
Treasury shares, common shares	3,508,447	3,502,827