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Commercial Mortgage Loan Portfolio (Footnotes) (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) option | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) option
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Provision for loan losses | $ 0 | $ 0 | $ 15,000,000 | $ 0 |
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Provision for loan losses | 0 |  | 10,000,000 |  |
Loans and Leases Receivable, Allowance | 10,000,000 |  | $ 10,000,000 |  | $ 0
Commercial Mortgage Portfolio Segment [Member] | Condo Construction [Member] | Condominium Bethesda, MD [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Option to extend loan agreement, term |  |  | 6 months |  | 6 months
Commercial Mortgage Portfolio Segment [Member] | 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 |  |  |  |  | $ 15,100,000
Commercial Mortgage Portfolio Segment [Member] | Hotel [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Option to extend loan agreement, term |  |  |  |  | 1 year
Number of options to extend loan agreement | option |  |  |  |  | 2
Commercial Mortgage Portfolio Segment [Member] | 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 | 36,643,000 |  | $ 36,643,000 |  | $ 40,034,000
Commercial Mortgage Portfolio Segment [Member] | 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 | 1,500,000 |  | $ 1,500,000 |  | $ 1,500,000
Commercial Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel, New York, NY, August 2018 [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Option to extend loan agreement, term |  |  | 1 year |  |
Number of options to extend loan agreement | option |  |  | 3 |  |
Unfunded loan commitments | 26,860,000 |  | $ 26,860,000 |  |
Commercial Mortgage Portfolio Segment [Member] | 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
Commercial Mortgage Portfolio Segment [Member] | 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 |  | 2
Commercial Mortgage Portfolio Segment [Member] | 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 |  |
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Option to extend loan agreement, term |  |  | 1 year |  |
Number of options to extend loan agreement | option |  |  | 2 |  |
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Unfunded loan commitments | 6,730,000 |  | $ 6,730,000 |  | $ 6,730,000
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - New York, NY, June 2018 [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of options to extend loan agreement | option |  |  | 6 |  |
Unfunded loan commitments | 4,931,000 |  | $ 4,931,000 |  |
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use, Chicago, IL [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Option to extend loan agreement, term |  |  | 1 year |  |
Number of options to extend loan agreement | option |  |  | 2 |  |
Unfunded loan commitments | 5,000,000 |  | $ 5,000,000 |  |
Commercial Mortgage Portfolio Segment [Member] | Retail [Member] | Retail - Brooklyn, NY [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Unfunded loan commitments |  |  |  |  | $ 9,000,000
Commercial Mortgage Portfolio Segment [Member] | 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 | 1,000,000 |  | $ 1,000,000 |  | $ 1,000,000
Commercial Mortgage Portfolio Segment [Member] | 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 | 2,430,000 |  | $ 2,430,000 |  |
Commercial Mortgage Portfolio Segment [Member] | Condo Conversion [Member] | Condo Conversion - Brooklyn, NY [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Unfunded loan commitments | $ 4,900,000 |  | $ 4,900,000 |  |

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