Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)	Preferred Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances at Dec. 31, 2019	$ 0	$ 305,035,000	$ 107,831,000	$ 3,695,000	$ 416,561,000
Employee stock purchase plan		14,000			14,000
Dividend reinvestment plan		192,000			192,000
Stock-based compensation expense		625,000			625,000
Share repurchase program		(6,282,000)			(6,282,000)
Cash dividends			(4,492,000)		(4,492,000)
Net income			10,673,000		10,673,000
Change in net unrealized holding gain/(loss) on securities available for sale, net of tax effect				1,098,000	1,098,000
Balances at Mar. 31, 2020	0	299,584,000	114,012,000	4,793,000	418,389,000
Balances at Dec. 31, 2020	0	302,029,000	134,039,000	5,486,000	441,554,000
Employee stock purchase plan		11,000			11,000
Dividend reinvestment plan		213,000			213,000
Stock-based compensation expense		643,000			643,000
Share repurchase program		(3,538,000)			(3,538,000)
Cash dividends			(4,636,000)		(4,636,000)
Net income			14,239,000		14,239,000
Change in net unrealized holding gain/(loss) on securities available for sale, net of tax effect				(7,243,000)	(7,243,000)
Balances at Mar. 31, 2021	$ 0	$ 299,358,000	$ 143,642,000	$ (1,757,000)	$ 441,243,000