Investment Securities (Schedule Of Amortized Cost And Fair Value By Contractual Maturity) (Details) - USD ($) $ in Thousands		Jun. 30, 2017		Dec. 31, 2016
Schedule of Investments [Line Items]
Within 1 year, Amortized Cost		$ 100
After 1 year; within 5 years, Amortized Cost		0
After 5 years; within 10 years, Amortized Cost		0
After 10 years, Amortized Cost		0
Subtotal, Amortized Cost		100
Within 1 year, Fair Value		100
After 1 year; within 5 years, Fair Value		9
After 5 years; within 10 years, Fair Value		582
After 10 years, Fair Value		572
Subtotal, Fair Value		1,263
Securities available for sale, Amortized Cost		3,964,419		$ 3,971,435	[1]
Securities available-for-sale		3,949,592	[2]	3,943,499	[1]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount		0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount		0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount		10,000
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount		0
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis		10,000
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value		0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value		0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value		9,991
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value		0
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value		9,991
Securities held to maturity, Amortized cost		10,000		14,347
Held-to-maturity Securities, Fair Value		9,991		14,773
Government Agency Issued MBS And CMO
Schedule of Investments [Line Items]
Securities available for sale, Amortized Cost	[3]	3,777,427
Securities available-for-sale	[3]	3,761,439
Securities held to maturity, Amortized cost	[3]	0
Held-to-maturity Securities, Fair Value	[3]	0
Equity and other
Schedule of Investments [Line Items]
Securities available for sale, Amortized Cost		186,892	[4]	186,756	[5]
Securities available-for-sale		186,890	[4]	$ 186,754	[5]
Securities held to maturity, Amortized cost		0
Held-to-maturity Securities, Fair Value		$ 0

[1] Includes $3.3 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.

[2] Includes $3.5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, 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, mutual funds, and cost method investments.

[5] Includes restricted investments in FHLB-Cincinnati stock of $87.9 million and FRB stock of $68.6 million. The remainder is money market, mutual funds, and cost method investments.