CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at at Dec. 31, 2016	$ 533,572	$ 23,901	$ 165,871	$ 350,414	$ (6,614)
Net income	44,942	0	0	44,942	0
Other comprehensive income, net of tax	3,137	0	0	0	3,137
Common stock dividends - $0.82, and $0.78 per share at September 30, 2018 and 2017 respectively.	(18,844)	0	0	(18,844)	0
Stock compensation expense	1,611	0	1,611	0	0
Common stock issued pursuant to:
Stock option plan - 19, 918 and 28, 736 shares at September 30, 2018 and 2017, respectively	550	29	521	0	0
Employee stock purchase plan - 21, 428 and 13, 486 shares at September 30, 2018 and 2017 respectively	465	13	452
Restricted stock - 37,705 and 47,064 shares at September 30, 2018 and 2017, respectively	(953)	47	(1,000)	0	0
Balance at at Sep. 30, 2017	564,480	23,990	167,455	376,512	(3,477)
Balance at at Dec. 31, 2017	563,816	23,996	168,188	378,489	(6,857)
Net income	75,298	0	0	75,298	0
Other comprehensive income, net of tax	(16,086)	0	0	0	(16,086)
Common stock dividends - $0.82, and $0.78 per share at September 30, 2018 and 2017 respectively.	(29,273)	0	0	(29,273)	0
Stock compensation expense	1,941	0	1,941	0	0
Common stock issued pursuant to:
Acquisition of WashingtonFirst Bankshares Inc. - 11,446,197 shares	446,640	11,446	435,194	0	0
Stock option plan - 19, 918 and 28, 736 shares at September 30, 2018 and 2017, respectively	423	20	403	0	0
Employee stock purchase plan - 21, 428 and 13, 486 shares at September 30, 2018 and 2017 respectively	717	22	695	0	0
Restricted stock - 37,705 and 47,064 shares at September 30, 2018 and 2017, respectively	(760)	38	(798)	0	0
Reclassfication of tax effects from other comprehensive income	0	0	0	1,477	(1,477)
Balance at at Sep. 30, 2018	$ 1,042,716	$ 35,522	$ 605,623	$ 425,991	$ (24,420)