Subsequent Events (Details) - USD ($)	Feb. 11, 2019	Jun. 04, 2018	Mar. 29, 2017
Subsequent Event [Line Items]
Common stock issued and sold (in shares)		2,750,000	5,175,000
Stock issuance expense		$ 265,000	$ 229,000
Subsequent Event [Member] | Series B Preferred Stock [Member]
Subsequent Event [Line Items]
Common stock issued and sold (in shares)	1,800,000
Percentage of offering of fixed-to-floating rate cumulative redeemable stock	8.25%
Preferred stock, par value (in dollars per shares)	$ 0.01
Net proceeds of redeemable preferred stock	$ 43,600,000
Stock issuance expense	$ 285,000
Preferred stock redemption price (in dollars per share)	$ 25.00
Number of shares of common stock on each share of Preferred stock (in shares)	2.68962
Preferred stock liquidation price (in dollars per share)	$ 25.00
Cumulative cash dividends (in dollars per share)	$ 2.0625
Subsequent Event [Member] | Series B Preferred Stock [Member] | LIBOR [Member]
Subsequent Event [Line Items]
Debt instrument term of variable rate	3 months
Debt instrument basis spread rate	5.631%