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Loans, net and allowance for loan losses - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
security
Sep. 30, 2014
USD ($)
security
Sep. 30, 2015
USD ($)
security
Sep. 30, 2014
USD ($)
security
Dec. 31, 2014
USD ($)
Receivables [Abstract]          
Net deferred loan costs $ 686   $ 686   $ 651
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk $ 2,962 $ 2,500 $ 2,962 $ 2,500 $ 2,933
Number of loans modified as troubled debt restructuring | security 0 1 8 1  
Number of defaults on loans restructured $ 0 $ 0 $ 0 $ 0  
Loans modified as troubled debt restructuring     $ 542