Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings (Deficit) [Member]	Non-Controlling Interest in Operating Partnership [Member]	Total
Beginning balance at Dec. 31, 2015	$ 75	$ 0	$ 148,332	$ (197)	$ 3,133	$ 994	$ 152,337
Beginning balance (in shares) at Dec. 31, 2015	7,519,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	$ 0	0	125	0	0	0	125
Issuance of common stock (in shares)	6,310
Net Income before dividends on preferred stock	$ 0	0	0	0	24,832	411	25,243
Other Comprehensive Income	0	0	0	(6,196)	0	0	(6,196)
LTIP-OP Unit awards	0	0	0	0	0	618	618
Distribution paid on LTIP-OP Units	0	0	0	0	0	(246)	(246)
Common dividends declared	0	0	0	0	(15,872)	0	(15,872)
Ending balance at Dec. 31, 2016	$ 75	0	148,457	(6,393)	12,093	1,777	156,009
Ending balance (in shares) at Dec. 31, 2016	7,525,348
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	$ 52	0	81,185	0	0	0	81,237
Issuance of common stock (in shares)	5,196,116
Issuance of preferred stock	$ 0	$ 57,917	0	0	0	0	57,917
Issuance of preferred stock (in shares)		2,400,000
Conversion of OP units	0	$ 0	0	0	0	(238)	(238)
Net Income before dividends on preferred stock	0	0	0	0	47,359	655	48,014
Other Comprehensive Income	0	0	0	3,451	0	0	3,451
LTIP-OP Unit awards	0	0	0	0	0	607	607
Distribution paid on LTIP-OP Units	0	0	0	0	0	(326)	(326)
Common dividends declared	0	0	0	0	(22,381)	0	(22,381)
Preferred dividends declared	0	0	0	0	(1,833)	0	(1,833)
Ending balance at Dec. 31, 2017	$ 127	$ 57,917	229,642	(2,942)	35,238	2,475	$ 322,457
Ending balance (in shares) at Dec. 31, 2017	12,721,464	2,400,000					12,721,464
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	$ 40	$ 0	68,972	0	0	0	$ 69,012
Issuance of common stock (in shares)	3,930,706
Issuance of preferred stock	$ 0	$ 7,722	0	0	0	0	7,722
Issuance of preferred stock (in shares)		318,206
Net Income before dividends on preferred stock	0	$ 0	0	0	37,285	488	37,773
Other Comprehensive Income	0	0	0	(35,458)	0	0	(35,458)
LTIP-OP Unit awards	0	0	0	0	0	662	662
Distribution paid on LTIP-OP Units	0	0	0	0	0	(367)	(367)
Common dividends declared	0	0	0	0	(32,573)	0	(32,573)
Preferred dividends declared	0	0	0	0	(5,297)	0	(5,297)
Ending balance at Dec. 31, 2018	$ 167	$ 65,639	$ 298,614	$ (38,400)	$ 34,653	$ 3,258	$ 363,931
Ending balance (in shares) at Dec. 31, 2018	16,652,170	2,718,206					16,652,170