CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common dividend declared, per share	$ 0.72	$ 0.65	$ 0.59
Common stock shares			138,239
Issuance of of common stock (shares)			138,239
Issuance of 2,224,091 shares of common stock for an acquisition (shares)			2,224,091
IPO
Common stock shares	3,590,065
Issuance of of common stock (shares)	3,590,065
Private Placement
Common stock shares			887,562
Issuance of of common stock (shares)			887,562
Series C preferred stock
Common stock shares			2,008,543
Issuance of of common stock (shares)			2,008,543
Series D preferred stock
Common stock shares			1,039,823
Issuance of of common stock (shares)			1,039,823
Series E preferred stock
Common stock shares			536,171
Issuance of of common stock (shares)			536,171
Series F preferred stock
Common stock shares			231,375
Issuance of of common stock (shares)			231,375