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, 2016	$ 155,360		$ 46,757	$ (1,583)	$ 113,448	$ (3,262)
Comprehensive income:
Net income	9,592				9,592
Other comprehensive income	3,651					3,651
Stock Issued During Period, Value, Stock Options Exercised	12		12
Share-based compensation expense	285		285
Stock Issued During Period, Value, Employee Stock Ownership Plan	681		358	323
Stock Issued During Period, Value, Acquisitions	32,968		32,968
Stock Issued During Period, Value, Dividend Reinvestment Plan	116		116
Common stock cash dividends declared	(3,883)				(3,883)
Ending Balance at Sep. 30, 2017	198,782		80,496	(1,260)	119,157	389
Beginning Balance at Dec. 31, 2017	201,505	[1]	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)

[1] Derived from audited consolidated financial statements