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Securities - Additional Information (Detail)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2014
USD ($)
option
May 31, 2014
USD ($)
ft²
room
casino
timeshare_unit
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]            
Realized loss on sale of securities     $ 1,042,000 $ 0    
Hotel | 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 | 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 | 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 | 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     $ 1,001,000   $ 1,470,000