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, 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)
Comprehensive income:
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	6,800
Stock Issued During Period, Shares, Employee Stock Ownership Plan	19,780
Common stock issuances from reinvested dividends, number of shares	10,214
Common Stock, Dividends, Per Share, Declared	$ 0.53
Stock Repurchased and Retired During Period, Shares	82,423
Net income	$ 31,866			31,866
Other comprehensive income	3,551				3,551
Exercise of stock options	7	7
Stock compensation expense	590	590
Stock Issued During Period, Value, Employee Stock Ownership Plan	530	305	225
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	238	238
Dividends, Common Stock, Cash	(7,361)			(7,361)
Ending Balance at Dec. 31, 2019	$ 247,764	80,084	(714)	165,859	2,535
Comprehensive income:
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	17,366
Stock Issued During Period, Shares, Employee Stock Ownership Plan	20,855
Stock Issued During Period, Shares, Acquisitions	465,931
Common stock issuances from reinvested dividends, number of shares	9,034
Common Stock, Dividends, Per Share, Declared	$ 0.59
Stock Repurchased and Retired During Period, Shares	417,577
Net income	$ 31,326			31,326
Other comprehensive income	2,910				2,910
Exercise of stock options	0	0
Stock compensation expense	527	527
Stock Issued During Period, Value, Employee Stock Ownership Plan	420	178	242
Stock Repurchased and Retired During Period, Value	(1,444)	(1,444)
Stock Issued During Period, Value, Acquisitions	15,354	15,354
Stock Issued During Period, Value, Dividend Reinvestment Plan	265	265
Dividends, Common Stock, Cash	(8,786)			(8,786)
Ending Balance at Dec. 31, 2020	$ 281,580	$ 94,964	$ (472)	$ 181,643	$ 5,445
Comprehensive income:
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	499
Stock Issued During Period, Shares, Employee Stock Ownership Plan	22,395
Stock Issued During Period, Shares, Acquisitions	570,000
Common stock issuances from reinvested dividends, number of shares	14,937
Common Stock, Dividends, Per Share, Declared	$ 0.68
Stock Repurchased and Retired During Period, Shares	75,333