Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Investment securities held-to-maturity (fair value $139,298 and $156,325 at March 31, 2021 and December 31, 2020, respectively)	$ 139,298	$ 156,325
Investment securities available-for-sale (amortized cost $239,314 and $221,254, net of allowance for credit losses of $485 and $869 at March 31, 2021 and December 31, 2020, respectively)	(485)	(869)
Investment securities available-for-sale (amortized cost $239,314 and $221,254, net of allowance for credit losses of $485 and $869 at March 31, 2021 and December 31, 2020, respectively)	$ 239,314	$ 221,254
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	48,000,000	48,000,000
Common stock, shares issued	31,556,799	31,556,799
Common stock, shares outstanding	29,379,575	29,295,052
Treasury stock, shares	2,177,224	2,261,747