Investment Securities (State And Municipal Obligations, By State And Economic Sector) (Details)	12 Months Ended
	Dec. 31, 2013 Y
Texas
Investment [Line Items]
% of Portfolio	9.90%
Average Life (in years)	4.1
Average Rating (Moody’s)	Aa1
Florida
Investment [Line Items]
% of Portfolio	9.30%
Average Life (in years)	4.6
Average Rating (Moody’s)	Aa3
Ohio
Investment [Line Items]
% of Portfolio	6.00%
Average Life (in years)	4.9
Average Rating (Moody’s)	Aa2
New York
Investment [Line Items]
% of Portfolio	5.50%
Average Life (in years)	6.3
Average Rating (Moody’s)	Aa2
Washington
Investment [Line Items]
% of Portfolio	5.40%
Average Life (in years)	5.0
Average Rating (Moody’s)	Aa2
General obligation
Investment [Line Items]
% of Portfolio	30.60%
Average Life (in years)	4.6
Average Rating (Moody’s)	Aa2
Lease
Investment [Line Items]
% of Portfolio	16.20%
Average Life (in years)	4.6
Average Rating (Moody’s)	Aa2
Housing
Investment [Line Items]
% of Portfolio	15.40%
Average Life (in years)	4.4
Average Rating (Moody’s)	Aa1
Transportation
Investment [Line Items]
% of Portfolio	13.90%
Average Life (in years)	4.2
Average Rating (Moody’s)	A1
Limited tax
Investment [Line Items]
% of Portfolio	5.60%
Average Life (in years)	5.4
Average Rating (Moody’s)	Aa1