Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of The Available For Sale Securities And Held To Maturity Securities) (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		$ 788,921	$ 1,520,517
Available for sale securities, unrealized gains	[1]	4,896	7,133
Available-for-sale Securities, Gross unrealized losses	[1]	(5,920)	(14,172)
Available-for-sale securities, Estimated fair value		787,897	1,513,478
Held-to-maturity securities, at amortized cost	[2]	1,125,426	1,177,565
Held-to-maturity Securities, Gross unrealized gains	[2]	26,296	38,338
Held-to-maturity Securities, Gross unrealized losses	[2]	(3,414)	(3,927)
Held-to-maturity securities, Estimated fair value	[2]	1,148,308	1,211,976
U.S. Government Agency Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		1,706	1,613
Available for sale securities, unrealized gains	[1]	5	1
Available-for-sale Securities, Gross unrealized losses	[1]	(1)	(4)
Available-for-sale securities, Estimated fair value		1,710	1,610
State And Municipal Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		76,238	76,518
Available for sale securities, unrealized gains	[1]	2	20
Available-for-sale Securities, Gross unrealized losses	[1]	(2,507)	(2,137)
Available-for-sale securities, Estimated fair value		73,733	74,401
Mortgage-backed Securities: Agency [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale securities, Estimated fair value		27,903	209,206
Held-to-maturity securities, at amortized cost		832,248
Mortgage-backed Securities: Agency [Member] | Mortgage-backed securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		28,187	206,982
Available for sale securities, unrealized gains	[1]	134	3,137
Available-for-sale Securities, Gross unrealized losses	[1]	(418)	(913)
Available-for-sale securities, Estimated fair value		27,903	209,206
Held-to-maturity securities, at amortized cost	[2]	832,248	884,451
Held-to-maturity Securities, Gross unrealized gains	[2]	21,522	32,926
Held-to-maturity Securities, Gross unrealized losses	[2]	(27)	(42)
Held-to-maturity securities, Estimated fair value	[2]	853,743	917,335
Mortgage-backed Securities: Commercial [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale securities, Estimated fair value		36,654	107,644
Held-to-maturity securities, at amortized cost		59,491
Mortgage-backed Securities: Commercial [Member] | Mortgage-backed securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		36,345	107,100
Available for sale securities, unrealized gains	[1]	313	633
Available-for-sale Securities, Gross unrealized losses	[1]	(4)	(89)
Available-for-sale securities, Estimated fair value		36,654	107,644
Held-to-maturity securities, at amortized cost	[2]	59,491	59,462
Held-to-maturity Securities, Gross unrealized gains	[2]	2,057	2,257
Held-to-maturity securities, Estimated fair value	[2]	61,548	61,719
Mortgage-backed Securities: Non-Agency [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale securities, Estimated fair value		2,934	3,137
Held-to-maturity securities, at amortized cost		973
Mortgage-backed Securities: Non-Agency [Member] | Mortgage-backed securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		2,970	3,186
Available for sale securities, unrealized gains	[1]	3	5
Available-for-sale Securities, Gross unrealized losses	[1]	(39)	(54)
Available-for-sale securities, Estimated fair value		2,934	3,137
Held-to-maturity securities, at amortized cost	[2]	973	1,081
Held-to-maturity Securities, Gross unrealized losses	[2]	(14)	(17)
Held-to-maturity securities, Estimated fair value	[2]	959	1,064
Corporate Fixed Income Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		187,699	336,210
Available for sale securities, unrealized gains	[1]	1,627	2,016
Available-for-sale Securities, Gross unrealized losses	[1]	(793)	(820)
Available-for-sale securities, Estimated fair value		188,533	337,406
Held-to-maturity securities, at amortized cost	[2]	55,191	55,236
Held-to-maturity Securities, Gross unrealized gains	[2]	2	4
Held-to-maturity Securities, Gross unrealized losses	[2]	(641)	(1,223)
Held-to-maturity securities, Estimated fair value	[2]	54,552	54,017
Asset-Backed Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		455,776	788,908
Available for sale securities, unrealized gains	[1]	2,812	1,321
Available-for-sale Securities, Gross unrealized losses	[1]	(2,158)	(10,155)
Available-for-sale securities, Estimated fair value		456,430	780,074
Held-to-maturity securities, at amortized cost	[2]	177,523	177,335
Held-to-maturity Securities, Gross unrealized gains	[2]	2,715	3,151
Held-to-maturity Securities, Gross unrealized losses	[2]	(2,732)	(2,645)
Held-to-maturity securities, Estimated fair value	[2]	$ 177,506	$ 177,841

[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income.

[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.