Consolidated Statements of Shareholders' Equity (unaudited) - USD ($) $ in Thousands	Total		Common Stock and Related Surplus [Member]	Unearned ESOP Shares [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2017	$ 201,505		$ 81,098	$ (1,152)	$ 119,827	$ 1,732
Comprehensive income:
Net income	20,622				20,622
Other comprehensive income	(4,637)					(4,637)
Stock Issued During Period, Value, Stock Options Exercised	29		29
Share-based compensation expense	292		292
Stock Issued During Period, Value, Employee Stock Ownership Plan	387		224	163
Stock Issued During Period, Value, Dividend Reinvestment Plan	179		179
Common stock cash dividends declared	(4,821)				(4,821)
Ending Balance at Sep. 30, 2018	213,556		81,822	(989)	135,628	(2,905)
Beginning Balance at Jun. 30, 2018	209,879		81,572	(1,043)	130,336	(986)
Comprehensive income:
Net income	6,899				6,899
Other comprehensive income	(1,919)					(1,919)
Stock Issued During Period, Value, Stock Options Exercised	25		25
Share-based compensation expense	99		99
Stock Issued During Period, Value, Employee Stock Ownership Plan	127		73	54
Stock Issued During Period, Value, Dividend Reinvestment Plan	53		53
Common stock cash dividends declared	(1,607)				(1,607)
Ending Balance at Sep. 30, 2018	213,556		81,822	(989)	135,628	(2,905)
Beginning Balance at Dec. 31, 2018	219,830	[1]	80,431	(939)	141,354	(1,016)
Comprehensive income:
Net income	23,718				23,718
Other comprehensive income	4,862					4,862
Stock Issued During Period, Value, Stock Options Exercised	7		7
Share-based compensation expense	430		430
Stock Issued During Period, Value, Employee Stock Ownership Plan	389		222	167
Stock Repurchased and Retired During Period, Value	(10,405)		(10,405)
Stock Issued During Period, Value, Acquisitions	8,918		8,918
Stock Issued During Period, Value, Dividend Reinvestment Plan	177		177
Common stock cash dividends declared	(5,504)				(5,504)
Ending Balance at Sep. 30, 2019	242,422		79,780	(772)	159,568	3,846
Beginning Balance at Jun. 30, 2019	235,701		80,946	(828)	153,362	2,221
Comprehensive income:
Net income	8,061				8,061
Other comprehensive income	1,625					1,625
Share-based compensation expense	149		149
Stock Issued During Period, Value, Employee Stock Ownership Plan	136		80	56
Stock Repurchased and Retired During Period, Value	(1,453)		(1,453)
Stock Issued During Period, Value, Dividend Reinvestment Plan	58		58
Common stock cash dividends declared	(1,855)				(1,855)
Ending Balance at Sep. 30, 2019	$ 242,422		$ 79,780	$ (772)	$ 159,568	$ 3,846

[1] Derived from audited consolidated financial statements