Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Investment securities held-to-maturity (fair value $115,661 and $156,325 at September 30, 2021 and December 31, 2020, respectively)	$ 115,661	$ 156,325
Investment securities available-for-sale (amortized cost $278,923 and $221,254, net of allowance for credit losses of $815 and $869 at September 30, 2021 and December 31, 2020, respectively)	815	869
Investment securities available-for-sale (amortized cost $278,923 and $221,254, net of allowance for credit losses of $815 and $869 at September 30, 2021 and December 31, 2020, respectively)	$ 278,923	$ 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	29,438,402	29,295,052
Treasury stock, shares	2,118,397	2,261,747