CONSOLIDATED STATEMENTS OF CONDITION (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 18,565	$ 19,281	$ 25,871
Allowance for loan losses	$ 15,852	$ 13,835	$ 14,020
Preferred stock, par value (in dollars per share)	$ 2.50	$ 2.50	$ 2.50
Preferred stock, shares authorized	20,000,000	20,000,000	20,000,000
Preferred stock, shares outstanding	0	0	0
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50	$ 2.50
Common stock, shares authorized	20,000,000	20,000,000	20,000,000
Common stock, shares issued	8,732,506	7,141,959	7,112,282
Common stock, shares outstanding	8,669,906	7,079,359	7,049,682
Treasury stock, shares	62,600	62,600	62,600