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Securities - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2016
USD ($)
May 31, 2014
USD ($)
ft²
casino
room
timeshare_unit
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Aug. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]                
Realized loss on sale of securities     $ 4,076,000 $ 225,000 $ 5,118,000 $ 225,000    
Hotel [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member]                
Mortgage Loans on Real Estate [Line Items]                
Number of hotel rooms | 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            
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]                
Realized loss on sale of securities $ 225,000       $ 5,118,000      
Amortized cost of fair value option 86,676,000              
Gross realized gain 90,000              
Gross realized loss 315,000              
Proceeds from sale of securities, net of line of credit repayment 16,222,000              
Wells Fargo [Member] | Line of Credit [Member]                
Mortgage Loans on Real Estate [Line Items]                
Repayment of line of credit $ 70,229,000