CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Beginning Balance at Dec. 31, 2018	$ 14,857	$ 278,659	$ 71,998	$ (1,796)	$ (464)	$ 363,254
Beginning Balance (in shares) at Dec. 31, 2018	14,857,092				(26,494)
Net income	$ 0	0	31,890	0	$ 0	31,890
Common stock repurchased	0	0	0	0	$ (4,877)	(4,877)
Common stock repurchased (in shares)					(157,439)
Other comprehensive income	0	0	0	12,169	$ 0	12,169
Dividends on common stock	0	0	(3,781)	0	0	(3,781)
Issuance of common shares for FPB acquisition	$ 2,378	75,842	0	0	0	78,220
Issuance of common shares for FPB acquisition (in shares)	2,377,501
Issuance of restricted stock grant	$ 75	(75)	0	0	0	0
Issuance of restricted stock grant(in shares)	75,215
Restricted stock grant forfeited	$ (2)	2	0	0	0	0
Restricted stock grant forfeited (in shares)	(2,250)
Compensation expense	$ 0	1,213	0	0	0	1,213
Ending Balance at Sep. 30, 2019	$ 17,308	355,641	100,107	10,373	$ (5,341)	478,088
Ending Balance (in shares) at Sep. 30, 2019	17,307,558				(183,933)
Beginning Balance at Jun. 30, 2019	$ 17,300	355,217	89,231	9,439	$ (4,906)	466,281
Beginning Balance (in shares) at Jun. 30, 2019	17,299,975				(170,060)
Net income	$ 0	0	12,272	0	$ 0	12,272
Common stock repurchased	0	0	0	0	$ (435)	(435)
Common stock repurchased (in shares)					(13,873)
Other comprehensive income	0	0	0	934	$ 0	934
Dividends on common stock	0	0	(1,396)	0	0	(1,396)
Issuance of restricted stock grant	$ 9	(9)	0	0	0	0
Issuance of restricted stock grant(in shares)	8,333
Restricted stock grant forfeited	$ (1)	1	0	0	0	0
Restricted stock grant forfeited (in shares)	(750)
Compensation expense	$ 0	432	0	0	0	432
Ending Balance at Sep. 30, 2019	$ 17,308	355,641	100,107	10,373	$ (5,341)	478,088
Ending Balance (in shares) at Sep. 30, 2019	17,307,558				(183,933)
Beginning Balance at Dec. 31, 2019	$ 18,997	409,805	110,460	10,089	$ (5,693)	543,658
Beginning Balance (in shares) at Dec. 31, 2019	18,996,948				(194,682)
Net income	$ 0	0	37,171	0	$ 0	37,171
Other comprehensive income	0	0	0	14,712	0	14,712
Dividends on common stock	0	0	(6,157)	0	0	(6,157)
Issuance of common shares for SWG acquisition	$ 2,547	45,311	0	0	0	47,858
Issuance of common shares for SWG acquisition (in shares)	2,546,967
Repurchase of restricted stock for payment of taxes	$ (14)	(423)	0	0	0	(437)
Repurchase of restricted stock for payment of taxes (in shares)	(13,643)
Issuance of restricted stock grant	$ 78	(78)	0	0	0	0
Issuance of restricted stock grant(in shares)	77,689
Restricted stock grant forfeited	$ (5)	5	0	0	0	0
Restricted stock grant forfeited (in shares)	(5,262)
Compensation expense	$ 0	1,564	0	0	0	1,564
Ending Balance at Sep. 30, 2020	$ 21,603	456,184	141,474	24,801	$ (5,693)	638,369
Ending Balance (in shares) at Sep. 30, 2020	21,602,699				(194,682)
Beginning Balance at Jun. 30, 2020	$ 21,590	455,650	131,698	24,550	$ (5,693)	627,795
Beginning Balance (in shares) at Jun. 30, 2020	21,589,940				(194,682)
Net income	$ 0	0	11,917	0	$ 0	11,917
Other comprehensive income	0	0	0	251	0	251
Dividends on common stock	0	0	(2,141)	0	0	(2,141)
Issuance of restricted stock grant	$ 13	(13)	0	0	0	0
Issuance of restricted stock grant(in shares)	13,259
Restricted stock grant forfeited	$ 0	0	0	0	0	0
Restricted stock grant forfeited (in shares)	(500)
Compensation expense	$ 0	547	0	0	0	547
Ending Balance at Sep. 30, 2020	$ 21,603	$ 456,184	$ 141,474	$ 24,801	$ (5,693)	$ 638,369
Ending Balance (in shares) at Sep. 30, 2020	21,602,699				(194,682)