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Business Segments (Details Textual) (USD $)	3 Months Ended
Business Segments (Details Textual) (USD $)	Mar. 31, 2013 Segment	Mar. 31, 2013 Trust and Investment Services [Member]	Mar. 31, 2012 Trust and Investment Services [Member]
Segment Reporting Information [Line Items]
Market value of assets held by trust and investment services segment		$ 3,500,000,000	$ 3,200,000,000
Total non-fiduciary assets		$ 3,100,000	$ 2,900,000
Business Segments (Textual) [Abstract]
Operating segments	2

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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