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Securities - Additional Information (Detail)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2014
USD ($)
ft²
timeshare_unit
room
casino
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Aug. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]              
Realized loss on sale of securities   $ 0 $ 0 $ 1,042,000 $ 0    
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       $ 1,042,000