Investment Securities (Schedule Of Maturities Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investment Holdings [Line Items]
Available-for-sale Securities, Three months or less, Amortized Cost	$ 15,169
Available-for-sale Securities, Over three months through twelve months, Amortized Cost	100,712
Available-for-sale Securities, After one year through five years, Amortized Cost	1,055,812
Available-for-sale Securities, After five years through ten years, Amortized Cost	554,722
Available-for-sale Securities, After ten years, Amortized Cost	70,804
Available-for-sale Securities, Amortized Cost	1,799,178
Available-for-sale Securities, Three months or less, Fair Value	15,204
Available-for-sale Securities, Over three months through twelve months, Fair Value	102,426
Available-for-sale Securities, After one year through five years, Fair Value	1,067,340
Available-for-sale Securities, After five years through ten years, Fair Value	534,083
Available-for-sale Securities, After ten years, Fair Value	69,961
Available-for-sale Securities, Fair Value	1,790,978
Held-to-maturity Securities, Three months or less, Amortized Cost	0
Held-to-maturity Securities, Over three months through twelve months, Amortized Cost	357
Held-to-maturity Securities, After one year through five years, Amortized Cost	728
Held-to-maturity Securities, After five years through ten years, Amortized Cost	44
Held-to-maturity Securities, After ten years, Amortized Cost	4,434
Held to maturity, at amortized cost	5,563	4,541
Held-to-maturity Securities, Three months or less, Fair Value	0
Held-to-maturity Securities, Over three months through twelve months, Fair Value	407
Held-to-maturity Securities, After one year through five years, Fair Value	983
Held-to-maturity Securities, After five years through ten years, Fair Value	49
Held-to-maturity Securities, After ten years, Fair Value	4,435
Held-to-maturity Securities, Fair Value	5,874	4,732
Other Investments Securities [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	1,959
Available-for-sale Securities, Fair Value	1,964
Held to maturity, at amortized cost	0
Held-to-maturity Securities, Fair Value	$ 0