Investment Securities (Schedule Of Amortized Cost And Fair Value By Contractual Maturity) (Details) - USD ($)		Mar. 31, 2016		Dec. 31, 2015	Mar. 31, 2015
Schedule of Investments [Line Items]
Within 1 year, Amortized Cost		$ 1,500,000
After 1 year; within 5 years, Amortized Cost		100,000
After 5 years; within 10 years, Amortized Cost		0
After 10 years, Amortized Cost		0
Subtotal, Amortized Cost		1,600,000
Within 1 year, Fair Value		1,500,000
After 1 year; within 5 years, Fair Value		100,000
After 5 years; within 10 years, Fair Value		0
After 10 years, Fair Value		0
Subtotal, Fair Value		1,600,000
Securities available for sale, Amortized Cost		3,945,416,000	[1]		$ 3,612,866,000	[2]
Securities available for sale, Fair Value		4,014,405,000	[1]	$ 3,929,846,000	3,672,331,000	[2]
HTM, Within 1 year, Amortized Cost		0
HTM, After 1 year; within 5 years, Amortized Cost		0
HTM, After 5 years; within 10 years, Amortized Cost		10,000,000
HTM, After 10 years, Amortized Cost		4,326,000
HTM Subtotal, Amortized Cost		14,326,000
HTM, Within 1 year, Fair Value		0
HTM, After 1 year; within 5 years, Fair Value		0
HTM, After 5 years; within 10 years, Fair Value		10,281,000
HTM, After 10 years, Fair Value		4,740,000
HTM Subtotal, Fair Value		15,021,000
Securities held to maturity, Amortized cost		14,326,000		$ 14,320,000	4,299,000
Securities held to maturity, Fair Value		15,021,000			5,451,000
Government Agency Issued MBS And CMO
Schedule of Investments [Line Items]
Securities available for sale, Amortized Cost	[3]	3,756,644,000
Securities available for sale, Fair Value	[3]	3,825,643,000
Securities held to maturity, Amortized cost		0
Securities held to maturity, Fair Value		0
Equity and other
Schedule of Investments [Line Items]
Securities available for sale, Amortized Cost		187,172,000	[4]		181,834,000	[5]
Securities available for sale, Fair Value		187,162,000	[4]		$ 181,638,000	[5]
Securities held to maturity, Amortized cost		0
Securities held to maturity, Fair Value		$ 0

[1] Includes $ 3 .1 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.

[2] Includes $ 3.2 billion of securities pledged to secure public deposits, securities sold under agreements to repu rchase, and for other purposes .

[3] Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

[4] Includes restricted investments in FHLB-Cincinnati stock of $ 87 . 9 million and FRB stock of $ 68.6 million. The remainder is money market and cost method investments.

[5] Includes restricted investments in FHLB-Cincinnati stock of $ 87.9 million and FRB stock of $ 66.0 million. The remainder is money market and cost method investments.