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Commercial Mortgage Loan Portfolio (Footnotes) (Detail) - Commercial mortgage loans [Member] $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) option | Dec. 31, 2015 USD ($) option
Mortgage Loans on Real Estate [Line Items] |  |
Unfunded loan commitments | $ 108,883 |
Condo Construction [Member] | Condominium Bethesda, MD [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 6 months | 6 months
Condo Construction [Member] | Condo Construction Bethesda, MD [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 6 months | 6 months
Unfunded loan commitments | $ 15,100 | $ 15,100
Hotel [Member] | Hotel - New York, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 1 year | 1 year
Number of options to extend loan agreement | option | 2 | 2
Unfunded loan commitments | $ 39,553 | $ 40,034
Hotel [Member] | Hotel, U.S. Virgin Islands [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 1 year | 1 year
Number of options to extend loan agreement | option | 3 | 3
Unfunded loan commitments | $ 1,500 | $ 1,500
Hotel, Mixed Use, Multifamily and Vacation Home [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 1 year | 1 year
Number of options to extend loan agreement | option | 2 | 2
Multifamily Conversion [Member] | Multifamily - Brooklyn, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 1 year | 1 year
Number of options to extend loan agreement | option | 3 | 3
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 6 months | 6 months
Number of options to extend loan agreement | option | 2 |
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL January 2016 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 1 year |
Unfunded loan commitments | $ 42,500 |
Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Unfunded loan commitments | $ 6,730 | $ 6,730
Retail [Member] | Retail - Brooklyn, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Unfunded loan commitments |  | $ 9,000
Office [Member] | Office, Richmond, VA [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 1 year | 1 year
Number of options to extend loan agreement | option | 2 | 2
Unfunded loan commitments | $ 1,000 | $ 1,000
Office [Member] | Office - Boston, MA [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Option to extend loan agreement, term | 6 months |
Number of options to extend loan agreement | option | 1 |
Unfunded loan commitments | $ 2,500 |

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