Investment Securities (Schedule Of Maturities Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Available-for-sale Securities, Three months or less, Amortized Cost	$ 11,267
Available-for-sale Securities, Over three months through twelve months, Amortized Cost	40,413
Available-for-sale Securities, After one year through five years, Amortized Cost	1,522,689
Available-for-sale Securities, After five years through ten years, Amortized Cost	887,929
Available-for-sale Securities, After ten years, Amortized Cost	103,914
Available-for-sale Securities, Amortized Cost	2,568,228
Available-for-sale Securities, Three months or less, Fair Value	11,314
Available-for-sale Securities, Over three months through twelve months, Fair Value	40,990
Available-for-sale Securities, After one year through five years, Fair Value	1,548,906
Available-for-sale Securities, After five years through ten years, Fair Value	879,608
Available-for-sale Securities, After ten years, Fair Value	106,135
Available-for-sale Securities, Fair Value	2,588,969
Held-to-maturity Securities, Three months or less, Amortized Cost	0
Held-to-maturity Securities, Over three months through twelve months, Amortized Cost	5
Held-to-maturity Securities, After one year through five years, Amortized Cost	27
Held-to-maturity Securities, After five years through ten years, Amortized Cost	29
Held-to-maturity Securities, After ten years, Amortized Cost	5,314
Securities held to maturity	5,519	5,563
Held-to-maturity Securities, Three months or less, Fair Value	0
Held-to-maturity Securities, Over three months through twelve months, Fair Value	5
Held-to-maturity Securities, After one year through five years, Fair Value	28
Held-to-maturity Securities, After five years through ten years, Fair Value	31
Held-to-maturity Securities, After ten years, Fair Value	5,575
Held-to-maturity Securities, Fair Value	5,783	5,874
Other Investments Securities [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	2,016
Available-for-sale Securities, Fair Value	2,016
Securities held to maturity	144
Held-to-maturity Securities, Fair Value	$ 144