Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Securities held-to-maturity, fair value	$ 156,325	$ 194,886
Securities, available-for-sale, amortized cost	221,254	$ 251,014
Securities, available-for-sale, allowance for credit loss	$ 869
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	29,295,052	29,334,629
Treasury stock, shares	2,261,747	2,222,170