Investment Securities (Schedule Of Maturities Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Available-for-sale Securities, Three months or less, Amortized Cost	$ 9,860
Available-for-sale Securities, Over three months through twelve months, Amortized Cost	56,364
Available-for-sale Securities, After one year through five years, Amortized Cost	1,486,535
Available-for-sale Securities, After five years through ten years, Amortized Cost	758,471
Available-for-sale Securities, After ten years, Amortized Cost	189,939
Available-for-sale Securities, Amortized Cost	2,503,185
Available-for-sale Securities, Three months or less, Fair Value	9,888
Available-for-sale Securities, Over three months through twelve months, Fair Value	57,003
Available-for-sale Securities, After one year through five years, Fair Value	1,513,798
Available-for-sale Securities, After five years through ten years, Fair Value	759,196
Available-for-sale Securities, After ten years, Fair Value	193,147
Available-for-sale Securities, Fair Value	2,535,121
Held-to-maturity Securities, Three months or less, Amortized Cost	0
Held-to-maturity Securities, Over three months through twelve months, Amortized Cost	0
Held-to-maturity Securities, After one year through five years, Amortized Cost	29
Held-to-maturity Securities, After five years through ten years, Amortized Cost	24
Held-to-maturity Securities, After ten years, Amortized Cost	4,900
Investment securities held to maturity	4,953us-gaap_HeldToMaturitySecurities	5,211us-gaap_HeldToMaturitySecurities
Held-to-maturity Securities, Three months or less, Fair Value	0
Held-to-maturity Securities, Over three months through twelve months, Fair Value	0
Held-to-maturity Securities, After one year through five years, Fair Value	30
Held-to-maturity Securities, After five years through ten years, Fair Value	25
Held-to-maturity Securities, After ten years, Fair Value	5,374
Held-to-maturity Securities, Fair Value	5,429	5,554
Other Investments Securities [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	2,016
Available-for-sale Securities, Fair Value	2,089
Investment securities held to maturity	0
Held-to-maturity Securities, Fair Value	$ 0

Available-for-sale Securities, Debt Maturities, Over Three Months Through Twelve Months, Amortized Cost

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the fifth through tenth fiscal year following the latest fiscal year.

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