Investment Securities (Schedule Of Maturities Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Investment Holdings [Line Items]
Available-for-sale Securities, Three months or less, Amortized Cost	$ 18,573
Available-for-sale Securities, Over three months through twelve months, Amortized Cost	191,763
Available-for-sale Securities, After one year through five years, Amortized Cost	1,294,846
Available-for-sale Securities, After five years through ten years, Amortized Cost	361,759
Available-for-sale Securities, After ten years, Amortized Cost	35,778
Available-for-sale Securities, Amortized Cost	1,904,678
Available-for-sale Securities, Three months or less, Fair Value	18,569
Available-for-sale Securities, Over three months through twelve months, Fair Value	194,660
Available-for-sale Securities, After one year through five years, Fair Value	1,303,726
Available-for-sale Securities, After five years through ten years, Fair Value	354,446
Available-for-sale Securities, After ten years, Fair Value	36,687
Available-for-sale Securities, Fair Value	1,910,082
Held-to-maturity Securities, Three months or less, Amortized Cost	0
Held-to-maturity Securities, Over three months through twelve months, Amortized Cost	338
Held-to-maturity Securities, After one year through five years, Amortized Cost	863
Held-to-maturity Securities, After five years through ten years, Amortized Cost	89
Held-to-maturity Securities, After ten years, Amortized Cost	4,476
Held-to-maturity Securities, Amortized Cost	5,766
Held-to-maturity Securities, Three months or less, Fair Value	0
Held-to-maturity Securities, Over three months through twelve months, Fair Value	378
Held-to-maturity Securities, After one year through five years, Fair Value	1,085
Held-to-maturity Securities, After five years through ten years, Fair Value	89
Held-to-maturity Securities, After ten years, Fair Value	4,478
Held-to-maturity Securities, Fair Value	6,030
Other Investments Securities [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	1,959
Available-for-sale Securities, Fair Value	1,994
Held-to-maturity Securities, Amortized Cost	0
Held-to-maturity Securities, Fair Value	$ 0