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Loans - Additional Information (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Loan
Dec. 31, 2014
USD ($)
Loan
Receivables [Abstract]    
Loans acquired $ 2.9 $ 0.8
Number of loans classified as troubled debt restructurings | Loan 2 2
Troubled debt restructuring balance $ 0.5 $ 0.5