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Network
2430405 - Disclosure - Estimated Fair Value Level 3 Reconciliation - Roll Forward (Details)
(http://www.fhlbboston.com/role/EstimatedFairValueLevel3ReconciliationRollForwardDetails)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001331463 (http://www.sec.gov/CIK)
Fair Value, Hierarchy [Axis]Level 3 [Member]
Fair Value by Measurement Frequency [Axis]Recurring [Member]
Asset Class [Axis]Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
 
Balance at beginning of year
0  
Purchases
9,350,000  
Unrealized losses included in other comprehensive income
(1,204,000) 
Balance at end of year
8,146,000