Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (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, debt maturities, within one year, Fair Value	[1]	$ 9,816
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	50,622
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	157,319
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	442,075
Available-for-sale Securities, debt maturities, Fair Value	[1]	659,832
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost		15,006
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost		40,162
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		59,506
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		981,119
Held-to-maturity Securities, Amortized cost	[2]	1,095,793	$ 1,177,565
U.S. Government Agency 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]	730
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	978
Available-for-sale Securities, debt maturities, Fair Value	[1]	1,708
State And Municipal 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]	7,394
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	66,785
Available-for-sale Securities, debt maturities, Fair Value	[1]	74,179
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]	9,086
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	49,563
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	30,075
Available-for-sale Securities, debt maturities, Fair Value	[1]	88,724
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost		15,006
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost		40,162
Held-to-maturity Securities, Amortized cost	[2]	55,168	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]	119,173
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	327,859
Available-for-sale Securities, debt maturities, Fair Value	[1]	447,032
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		177,617
Held-to-maturity Securities, Amortized cost	[2]	177,617	177,335
Mortgage-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		677
Availably-for-sale Securities, debt maturities, after ten years, Fair Value		47,431
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		59,506
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		803,502
Mortgage-backed securities [Member] | Agency [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]	677
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	26,744
Available-for-sale Securities, debt maturities, Fair Value	[1]	27,421
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		802,549
Held-to-maturity Securities, Amortized cost	[2]	802,549	884,451
Mortgage-backed securities [Member] | Commercial [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	17,983
Available-for-sale Securities, debt maturities, Fair Value	[1]	17,983
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		59,506
Held-to-maturity Securities, Amortized cost	[2]	59,506	59,462
Mortgage-backed securities [Member] | 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]	81
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	2,704
Available-for-sale Securities, debt maturities, Fair Value	[1]	2,785
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		953
Held-to-maturity Securities, Amortized cost	[2]	$ 953	$ 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.