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Loans - Purchased credit-impaired loans (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance   $ 2,465 $ 0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 2,465   0
Real estate
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance $ 2,465   $ 0