Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Investment securities, available for sale, allowance	$ 2	$ 0
Investment securities held to maturity, fair value	$ 93,868	$ 124,904
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	50,610,681	50,498,410
Common stock, shares outstanding (in shares)	50,479,646	50,498,410
Treasury stock (in shares)	131,035	0