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		Sep. 30, 2015	Dec. 31, 2014
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		$ 663,772	$ 1,520,517
Available for sale securities, unrealized gains	[1]	2,917	7,133
Available-for-sale Securities, Gross unrealized losses	[1]	(6,857)	(14,172)
Available-for-sale securities, Estimated fair value		659,832	1,513,478
Held-to-maturity Securities, Amortized cost	[2]	1,095,793	1,177,565
Held-to-maturity Securities, Gross unrealized gains	[2]	40,047	38,338
Held-to-maturity Securities, Gross unrealized losses	[2]	(3,338)	(3,927)
Held-to-maturity securities, Estimated fair value	[2]	1,132,502	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		1,703	1,613
Available for sale securities, unrealized gains	[1]	7	1
Available-for-sale Securities, Gross unrealized losses	[1]	(2)	(4)
Available-for-sale securities, Estimated fair value		1,708	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		76,095	76,518
Available for sale securities, unrealized gains	[1]	10	20
Available-for-sale Securities, Gross unrealized losses	[1]	(1,926)	(2,137)
Available-for-sale securities, Estimated fair value		74,179	74,401
Corporate Fixed Income Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		88,270	336,210
Available for sale securities, unrealized gains	[1]	1,050	2,016
Available-for-sale Securities, Gross unrealized losses	[1]	(595)	(820)
Available-for-sale securities, Estimated fair value		88,725	337,406
Held-to-maturity Securities, Amortized cost	[2]	55,168	55,236
Held-to-maturity Securities, Gross unrealized gains	[2]		4
Held-to-maturity Securities, Gross unrealized losses	[2]	(385)	(1,223)
Held-to-maturity securities, Estimated fair value	[2]	54,783	54,017
Asset-Backed Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		449,685	788,908
Available for sale securities, unrealized gains	[1]	1,342	1,321
Available-for-sale Securities, Gross unrealized losses	[1]	(3,995)	(10,155)
Available-for-sale securities, Estimated fair value		447,032	780,074
Held-to-maturity Securities, Amortized cost	[2]	177,617	177,335
Held-to-maturity Securities, Gross unrealized gains	[2]	2,429	3,151
Held-to-maturity Securities, Gross unrealized losses	[2]	(2,913)	(2,645)
Held-to-maturity securities, Estimated fair value	[2]	177,133	177,841
Mortgage-backed securities [Member] | Agency [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		27,415	206,982
Available for sale securities, unrealized gains	[1]	294	3,137
Available-for-sale Securities, Gross unrealized losses	[1]	(289)	(913)
Available-for-sale securities, Estimated fair value		27,420	209,206
Held-to-maturity Securities, Amortized cost	[2]	802,549	884,451
Held-to-maturity Securities, Gross unrealized gains	[2]	34,457	32,926
Held-to-maturity Securities, Gross unrealized losses	[2]	(27)	(42)
Held-to-maturity securities, Estimated fair value	[2]	836,979	917,335
Mortgage-backed securities [Member] | Commercial [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		17,775	107,100
Available for sale securities, unrealized gains	[1]	212	633
Available-for-sale Securities, Gross unrealized losses	[1]	(4)	(89)
Available-for-sale securities, Estimated fair value		17,983	107,644
Held-to-maturity Securities, Amortized cost	[2]	59,506	59,462
Held-to-maturity Securities, Gross unrealized gains	[2]	3,161	2,257
Held-to-maturity securities, Estimated fair value	[2]	62,667	61,719
Mortgage-backed securities [Member] | Non-Agency [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		2,829	3,186
Available for sale securities, unrealized gains	[1]	2	5
Available-for-sale Securities, Gross unrealized losses	[1]	(46)	(54)
Available-for-sale securities, Estimated fair value		2,785	3,137
Held-to-maturity Securities, Amortized cost	[2]	953	1,081
Held-to-maturity Securities, Gross unrealized losses	[2]	(13)	(17)
Held-to-maturity securities, Estimated fair value	[2]	$ 940	$ 1,064

[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.