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Secured Borrowings and Collateral (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
First mortgage loans on owner-occupied residential property
 
Secured borrowings and collateral  
Amount of qualified collateral pledged on FHLB Boston advances $ 85.1
Mortgage-backed securities
 
Secured borrowings and collateral  
Amount of qualified collateral pledged on FHLB Boston advances $ 17.9