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Borrowings (Narrative Federal Home Loan Bank Advances) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank, Advances	$ 373.3	$ 361.2
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	8.0
Federal Home Loan Bank of Boston [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 470.5	$ 536.2

Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

Amount of federal home loan bank advances. Advances are loans from the federal home loan bank system to a member (shareholder).