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Debt Securities - Additional Information (Details)
ft² in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
Aug. 31, 2016
USD ($)
Feb. 28, 2015
USD ($)
May 31, 2014
USD ($)
timeshare_unit
May 31, 2014
USD ($)
casino
May 31, 2014
USD ($)
room
May 31, 2014
USD ($)
ft²
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
option
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Schedule of Available-for-sale Securities [Line Items]                                        
Realized gain (loss) on sale of securities               $ 4,059,000 $ (225,000) $ 0 $ 0 $ 0 $ 0 $ 0 $ (443,000) $ 3,834,000 $ (443,000) $ 0    
Commercial Mortgage Backed Securities [Member]                                        
Schedule of Available-for-sale Securities [Line Items]                                        
Amortized cost of debt securities sold     $ 24,038,000                                  
Realized gain (loss) on sale of securities $ (1,245,000) $ (225,000) 0                                  
Realized gain on sale of debt securities     43,000                                  
Realized loss on sale of debt securities     486,000                                  
Proceeds from sale of debt securities, net of debt facility repayment     1,341,000                                  
Reclassification out of accumulated other comprehensive income     678,000                                  
Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member]                                        
Schedule of Available-for-sale Securities [Line Items]                                        
Property size, number of units/rooms/casinos       114 2 442                            
Property size, area | ft²             131,500                          
Term of loan                               3 years        
Number of options to extend loan agreement | option                               2        
Option to extend loan agreement, term                               1 year        
Appraised loan to value ratio                               60.00%        
Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member] | First Mortgage [Member]                                        
Schedule of Available-for-sale Securities [Line Items]                                        
Original face amount       $ 155,000,000 $ 155,000,000 $ 155,000,000 $ 155,000,000                          
Senior Participation [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member]                                        
Schedule of Available-for-sale Securities [Line Items]                                        
Participations sold                                     $ 90,000,000 $ 90,000,000
Junior Participation [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member]                                        
Schedule of Available-for-sale Securities [Line Items]                                        
Participations sold                                     $ 65,000,000 $ 65,000,000
Line of Credit [Member] | Wells Fargo [Member]                                        
Schedule of Available-for-sale Securities [Line Items]                                        
Repayments of debt facility     $ 22,254,000