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Loans, Allowance for Loan Losses and Credit Quality (Details 12) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Outstanding balance $ 30,705 $ 36,278
Carrying amount $ 27,675 $ 32,054