Loans (Troubled Debt Restructurings, Subsequently Defaulted) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 Number	Mar. 31, 2012 Number
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	2
Defaulted payment following modification for troubled debt restructurings	$ 0	$ 857
Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Defaulted payment following modification for troubled debt restructurings	0	565
Commercial Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Defaulted payment following modification for troubled debt restructurings	$ 0	$ 292