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Debt Securities - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2016
USD ($)
Feb. 28, 2015
USD ($)
Aug. 31, 2014
USD ($)
option
May 31, 2014
USD ($)
ft²
casino
room
timeshare_unit
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]                  
Realized loss on sale of securities         $ 225,000 $ 0 $ 225,000 $ 443,000  
Hotel [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Property size, number of units/keys | room       442          
Number of timeshare units in real estate property | timeshare_unit       114          
Number of casinos in real estate property | casino       2          
Property size, area (in square feet) | 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%            
First Mortgage [Member] | Hotel [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Mortgage loan, face amount       $ 155,000,000          
Senior Participation [Member] | Hotel [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Participation in loan, amount     $ 90,000,000           $ 90,000,000
Junior Participation [Member] | Hotel [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Participation in loan, amount     $ 65,000,000           $ 65,000,000
Commercial Mortgage Backed Securities [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Amortized cost of debt securities sold $ 86,676,000 $ 24,038,000              
Realized loss on sale of securities 225,000 443,000              
Realized gain on sale of debt securities 90,000 43,000              
Realized loss on sale of debt securities 315,000 486,000              
Reclassification out of accumulated other comprehensive income   678,000              
Proceeds from sale of debt securities, net of debt facility repayment   1,341,000              
Line of Credit [Member] | Wells Fargo [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Repayment of debt facility $ 70,229,000 $ 22,254,000