Loans and reserve for credit losses (Details 10) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3,500	$ 3
Commerical real estate [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	3,500	0
Construction [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Residential real estate [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial and industrial loans [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Consumer Loans [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 3