Use of estimates (Policies)
9 Months Ended
Sep. 30, 2012
Use of estimates [Abstract]  
Use of estimates
The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the balance sheets and statements of income for the period. Actual results could differ significantly from those estimates. A material estimate that is particularly susceptible to significant change in the near term relates to the determination of the allowance for loan losses and the related provision.