Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, within one year, Fair Value	[1]	$ 9,724
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	257,065
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	271,760
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	1,091,358
Available-for-sale Securities, debt maturities, Fair Value	[1]	1,629,907
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost		40,145
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		269,700
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		1,545,554
Held-to-maturity Securities, Amortized cost	[2]	1,855,399	$ 1,177,565
U S Government Corporations And Agencies Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, within one year, Fair Value	[1]	701
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	997
Available-for-sale Securities, debt maturities, Fair Value	[1]	1,698
U S States And Political Subdivisions
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	7,333
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	66,834
Available-for-sale Securities, debt maturities, Fair Value	[1]	74,167
Corporate Fixed Income Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, within one year, Fair Value	[1]	9,023
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	256,001
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	54,384
Available-for-sale Securities, debt maturities, Fair Value	[1]	319,408
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost		40,145
Held-to-maturity Securities, Amortized cost	[2]	40,145	55,236
Asset-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	209,429
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	706,484
Available-for-sale Securities, debt maturities, Fair Value	[1]	915,913
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		496,996
Held-to-maturity Securities, Amortized cost	[2]	496,996	177,335
Mortgage Backed Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, after five through ten years, fair value		614
Availably-for-sale Securities, debt maturities, after ten years, Fair Value		318,040
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		269,700
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		1,048,558
Mortgage Backed Securities | Agency Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	614
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	304,279
Available-for-sale Securities, debt maturities, Fair Value	[1]	304,893
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		210,179
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		1,047,629
Held-to-maturity Securities, Amortized cost	[2]	1,257,808	884,451
Mortgage Backed Securities | Commercial Mortgage Backed Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	11,310
Available-for-sale Securities, debt maturities, Fair Value	[1]	11,310
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		59,521
Held-to-maturity Securities, Amortized cost	[2]	59,521	59,462
Mortgage Backed Securities | Non-Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	67
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	2,451
Available-for-sale Securities, debt maturities, Fair Value	[1]	2,518
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		929
Held-to-maturity Securities, Amortized cost	[2]	$ 929	$ 1,081

[1] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.

[2] Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.