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Commitments and Contingencies Acquisition (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Oct. 22, 2012 American Heritage Holdings [Member] Scenario, Forecast [Member]	Dec. 31, 2012 Acquiree [Member] Boston Private [Member]
Business Acquisition [Line Items]
Consideration			$ 6,500,000
Aggregate loans of acquiree				270,000,000
Deposits of acquiree	$ 6,436,117,000	$ 6,485,818,000		$ 200,000,000

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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