CONSOLIDATED STATEMENTS OF CONDITION (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 14,110	$ 19,281	$ 22,518
Allowance for loan losses	$ 19,200	$ 13,835	$ 13,924
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	8,765,913	7,141,959	7,137,139
Common stock, shares outstanding	8,703,313	7,079,359	7,074,539
Treasury stock, shares	62,600	62,600	62,600