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Investment Securities (Schedule Of Amortized Cost And Fair Value By Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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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.

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