Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Income
Net income	$ 20,329	$ 10,467	$ 14,758	$ 9,130	$ 8,754	$ 11,599	$ 7,625	$ 5,149	$ 54,684	$ 33,127	$ 28,383
Dividends on Preferred Stock	(833)	(833)	(832)	(832)	(833)	(762)	(202)	(205)	(3,330)	(2,002)	0
Net Income allocated to Common Shareholders	$ 19,496	$ 9,634	$ 13,926	$ 8,298	$ 7,921	$ 10,837	$ 7,423	$ 4,944	$ 51,354	$ 31,125	$ 28,383
Weighted-Average Shares
Weighted average shares - Basic									22,551,452	21,111,208	21,075,475
Effect of dilutive securities-restricted stock awards									16,702	2,227
Weighted average shares - diluted									22,568,154	21,113,435	21,075,475
Per Share Amount
Basic earnings per share	$ 0.73	$ 0.45	$ 0.66	$ 0.39	$ 0.38	$ 0.51	$ 0.36	$ 0.23	$ 2.28	$ 1.47	$ 1.35
Diluted earnings per share	$ 0.73	$ 0.45	$ 0.66	$ 0.39	$ 0.38	$ 0.51	$ 0.36	$ 0.23	$ 2.28	$ 1.47	$ 1.35