Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Investment securities held-to-maturity, fair value	$ 156,579	$ 132,794
Common Stock, Par Value	$ 1.00	$ 1.00
Common Stock, Shares Authorized	20,000,000	20,000,000
Common Stock, Shares, Issued	11,507,164	8,511,835
Common Stock, Shares, Outstanding	11,408,712	8,419,183
Treasury Stock, Shares	98,452	92,652