Consolidated Statements of Shareholders' Equity - 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, 2015	$ 143,744	$ 45,741	$ (1,964)	$ 100,423	$ (456)
Comprehensive income:
Net income	17,297			17,297
Other comprehensive income	(2,806)				(2,806)
Exercise of stock options	447	447
Stock compensation expense	200	200
Stock Issued During Period, Value, Employee Stock Ownership Plan	649	268	381
Stock Issued During Period, Value, Dividend Reinvestment Plan	101	101
Dividends, Common Stock, Cash	(4,272)			(4,272)
Ending Balance at Dec. 31, 2016	155,360	46,757	(1,583)	113,448	(3,262)
Comprehensive income:
Net income	11,915			11,915
Other comprehensive income	4,696				4,696
Tax Cuts and Jobs Act of 2017 Reclassification from AOCI to Retained Earnings	0			(298)	298
Exercise of stock options	304	304
Stock compensation expense	385	385
Stock Issued During Period, Value, Employee Stock Ownership Plan	946	515	431
Stock Issued During Period, Value, Acquisitions	32,968	32,968
Stock Issued During Period, Value, Dividend Reinvestment Plan	169	169
Dividends, Common Stock, Cash	(5,238)			(5,238)
Ending Balance at Dec. 31, 2017	201,505	81,098	(1,152)	119,827	1,732
Comprehensive income:
Net income	28,072			28,072
Other comprehensive income	(2,748)				(2,748)
Exercise of stock options	122	122
Stock compensation expense	391	391
Stock Issued During Period, Value, Employee Stock Ownership Plan	485	272	213
Stock Repurchased and Retired During Period, Value	(1,689)	(1,689)
Stock Issued During Period, Value, Dividend Reinvestment Plan	237	237
Dividends, Common Stock, Cash	(6,545)			(6,545)
Ending Balance at Dec. 31, 2018	$ 219,830	$ 80,431	$ (939)	$ 141,354	$ (1,016)