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Loans and allowance for credit losses (Details 3) (Troubled Debt Restructurings [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Contracts
Mar. 31, 2012
Contracts
Number of contracts 4 4
Premodification outstanding recorded investment $ 648 $ 5,449
Postmodification outstanding recorded investment 659 5,595
Related allowance 0 0
Construction Loans [Member]
   
Number of contracts 2 2
Premodification outstanding recorded investment 123 98
Postmodification outstanding recorded investment 123 98
Related allowance 0 0
Residential Real Estate [Member]
   
Number of contracts 2 0
Premodification outstanding recorded investment 525 0
Postmodification outstanding recorded investment 536 0
Related allowance 0 0
Commercial Real Estate [Member]
   
Number of contracts 0 2
Premodification outstanding recorded investment 0 5,351
Postmodification outstanding recorded investment 0 5,497
Related allowance 0 0
Commercial Loan [Member]
   
Number of contracts 0 0
Premodification outstanding recorded investment 0 0
Postmodification outstanding recorded investment 0 0
Related allowance 0 0
Consumer Loan [Member]
   
Number of contracts 0 0
Premodification outstanding recorded investment   0
Postmodification outstanding recorded investment 0 0
Related allowance $ 0 $ 0