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Loans and allowance for credit losses (Details 4) (Troubled Debt Restructurings that Subsequently Defaulted [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Contracts
Mar. 31, 2012
Contracts
Number of contracts 3 [1] 3 [1]
Recorded investment $ 1,918 [1] $ 1,539 [1]
Related allowance 74 [1] 0 [1]
Construction Loans [Member]
    
Number of contracts 0 [1] 1 [1]
Recorded investment 0 [1] 666 [1]
Related allowance 0 [1] 0 [1]
Residential Real Estate [Member]
    
Number of contracts 2 [1] 2 [1]
Recorded investment 177 [1] 873 [1]
Related allowance 0 [1] 0 [1]
Commercial Real Estate [Member]
    
Number of contracts 1 [1] 0 [1]
Recorded investment 1,741 [1] 0 [1]
Related allowance 74 [1] 0 [1]
Commercial Loan [Member]
    
Number of contracts 0 [1] 0 [1]
Recorded investment 0 [1] 0 [1]
Related allowance 0 [1] 0 [1]
Consumer Loan [Member]
    
Number of contracts 0 [1] 0 [1]
Recorded investment 0 [1] 0 [1]
Related allowance $ 0 [1] $ 0 [1]
[1] Generally, a loan is considered in default when principal or interest is past due 30 days or more.