Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Preferred Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances at Dec. 31, 2020			$ 0	$ 302,029,000	$ 134,039,000	$ 5,486,000	$ 441,554,000
Employee stock purchase plan				22,000			22,000
Dividend reinvestment plan				411,000			411,000
Stock grants to directors for retainer fees				344,000			344,000
Stock-based compensation expense				1,277,000			1,277,000
Cash dividends					(9,220,000)		(9,220,000)
Net income					32,331,000		32,331,000
Change in net unrealized holding gain/(loss) on securities available for sale, net of tax effect						(3,980,000)	(3,980,000)
Share repurchase program				(10,851,000)			(10,851,000)
Balances at Jun. 30, 2021			0	293,232,000	157,150,000	1,506,000	451,888,000
Balances at Mar. 31, 2021			0	299,358,000	143,642,000	(1,757,000)	441,243,000
Employee stock purchase plan				11,000			11,000
Dividend reinvestment plan				198,000			198,000
Stock grants to directors for retainer fees				344,000			344,000
Stock-based compensation expense				634,000			634,000
Cash dividends					(4,583,000)		(4,583,000)
Net income					18,091,000		18,091,000
Change in net unrealized holding gain/(loss) on securities available for sale, net of tax effect						3,263,000	3,263,000
Share repurchase program				(7,313,000)			(7,313,000)
Balances at Jun. 30, 2021			0	293,232,000	157,150,000	1,506,000	451,888,000
Balances (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2021	$ 316,000	$ 316,000
Balances at Dec. 31, 2021			0	285,752,000	174,536,000	(3,729,000)	456,559,000
Employee stock purchase plan				21,000			21,000
Dividend reinvestment plan				435,000			435,000
Stock grants to directors for retainer fees				347,000			347,000
Stock-based compensation expense				1,608,000			1,608,000
Cash dividends					(9,629,000)		(9,629,000)
Net income					23,229,000		23,229,000
Change in net unrealized holding gain/(loss) on securities available for sale, net of tax effect						(43,939,000)	(43,939,000)
Stock option exercises				36,000			36,000
Balances at Jun. 30, 2022			0	288,199,000	188,452,000	(47,668,000)	428,983,000
Balances at Mar. 31, 2022			0	286,831,000	181,532,000	(31,892,000)	436,471,000
Employee stock purchase plan				11,000			11,000
Dividend reinvestment plan				213,000			213,000
Stock grants to directors for retainer fees				347,000			347,000
Stock-based compensation expense				797,000			797,000
Cash dividends					(4,817,000)		(4,817,000)
Net income					11,737,000		11,737,000
Change in net unrealized holding gain/(loss) on securities available for sale, net of tax effect						(15,776,000)	(15,776,000)
Balances at Jun. 30, 2022			$ 0	$ 288,199,000	$ 188,452,000	$ (47,668,000)	$ 428,983,000