Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Securities Held-to-Maturity, Fair Value	$ 229,552	$ 194,886
Securities, Available-for-sale, Allowance for Credit Loss	$ 897
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	29,164,782	29,334,629
Treasury stock, shares	2,392,017	2,222,170