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Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Equity [Abstract]      
Common stock authorized 500,000,000   500,000,000
Common stock par value $ 0.01   $ 0.01
Preferred stock authorized 100,000,000   100,000,000
Preferred stock par value $ 0.01   $ 0.01
Common stock, shares issued 12,827,850   13,340,217
Preferred shares issued 0   0
Dividends declared (in dollars per share) $ 0.37 $ 0.40  
Dividends $ (4,746) $ (3,652)  
Common Stock, Capital Shares Reserved for Future Issuance 340,461    
Stock Repurchase Program, Authorized Amount $ 1,200    
Repurchase of common shares, shares (512,367) 0  
Repurchase of common shares, Value $ (5,741)    
Stock Repurchases Average Price Per Share $ 11.21    
Intended Distribution of Taxable Net Income, Percentage on Annual Basis 100.00%