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Secured Borrowings and Collateral (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
First mortgage loans on owner-occupied residential property
Secured borrowings and collateral
Amount of qualified collateral pledged on FHLB Boston borrowings	$ 84.1
Mortgage-backed securities
Secured borrowings and collateral
Amount of qualified collateral pledged on FHLB Boston borrowings	$ 10.8

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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