Investment Securities (Schedule Of Amortized Cost And Fair Value By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012	Sep. 30, 2012
Schedule of Investments [Line Items]
Within 1 year, Amortized Cost	$ 39,993
After 1 year; within 5 years, Amortized Cost	3,881
After 5 years; within 10 years, Amortized Cost	0
After 10 years, Amortized Cost	13,655
Subtotal, Amortized Cost	57,529
Within 1 year, Fair Value	39,996
After 1 year; within 5 years, Fair Value	4,028
After 5 years; within 10 years, Fair Value	0
After 10 years, Fair Value	13,655
Subtotal, Fair Value	57,679
Securities available for sale, Amortized Cost	3,168,118	[1]		3,019,009	[2]
Securities available for sale	3,186,943	[1]	3,061,808	3,123,629	[2]
Government Agency Issued Mbs And Cmo [Member]
Schedule of Investments [Line Items]
Securities available for sale, Amortized Cost	2,881,880
Securities available for sale	2,900,572
Equity And Other Debt Securities [Member]
Schedule of Investments [Line Items]
Securities available for sale, Amortized Cost	228,709	[3]		220,247	[4]
Securities available for sale	$ 228,692	[3]		$ 220,270	[4]

[1] Includes $2.9 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.

[2] Includes $2.8 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.

[3] Includes restricted investments in FHLB-Cincinnati stock of $128.0 million and FRB stock of $66.0 million. The remainder is money market, venture capital, and cost method investments.

[4] Includes restricted investments in FHLB-Cincinnati stock of $125.5 million and FRB stock of $66.0 million. The remainder is money market, venture capital, and cost method investments.