Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Debt securities, Available-for-sale, Estimated fair value, Within one year	[1]	$ 31,290
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	[1]	129,127
Debt securities, Available-for-sale, Estimated fair value, After five years through ten years	[1]	115,822
Debt securities, Available-for-sale, Estimated fair value, After ten years	[1]	511,658
Debt securities, Available-for-sale, Estimated fair value, Total	[1]	787,897
Debt securities, Held-to-maturity, Amortized cost, Within one year		15,013
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount		40,178
Debt securities, Held-to-maturity, Amortized cost, After five years through ten years		59,491
Debt securities, Held-to-maturity, Amortized cost, After ten years		1,010,744
Held-to-maturity securities, Amortized cost	[2]	1,125,426	$ 1,177,565
U.S. Government Agency Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Debt securities, Available-for-sale, Estimated fair value, Within one year	[1]	732
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	[1]	978
Debt securities, Available-for-sale, Estimated fair value, Total	[1]	1,710
State And Municipal Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Debt securities, Available-for-sale, Estimated fair value, After five years through ten years	[1]	1,671
Debt securities, Available-for-sale, Estimated fair value, After ten years	[1]	72,062
Debt securities, Available-for-sale, Estimated fair value, Total	[1]	73,733
Mortgage-backed Securities: Agency [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Debt securities, Available-for-sale, Estimated fair value, After five years through ten years	[1]	804
Debt securities, Available-for-sale, Estimated fair value, After ten years	[1]	27,099
Debt securities, Available-for-sale, Estimated fair value, Total	[1]	27,903
Debt securities, Held-to-maturity, Amortized cost, After ten years		832,248
Held-to-maturity securities, Amortized cost		832,248
Mortgage-backed Securities: Commercial [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Debt securities, Available-for-sale, Estimated fair value, After ten years	[1]	36,654
Debt securities, Available-for-sale, Estimated fair value, Total	[1]	36,654
Debt securities, Held-to-maturity, Amortized cost, After five years through ten years		59,491
Held-to-maturity securities, Amortized cost		59,491
Mortgage-backed Securities: Non-Agency [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	[1]	95
Debt securities, Available-for-sale, Estimated fair value, After ten years	[1]	2,839
Debt securities, Available-for-sale, Estimated fair value, Total	[1]	2,934
Debt securities, Held-to-maturity, Amortized cost, After ten years		973
Held-to-maturity securities, Amortized cost		973
Corporate Fixed Income Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Debt securities, Available-for-sale, Estimated fair value, Within one year	[1]	30,558
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	[1]	128,054
Debt securities, Available-for-sale, Estimated fair value, After five years through ten years	[1]	29,921
Debt securities, Available-for-sale, Estimated fair value, Total	[1]	188,533
Debt securities, Held-to-maturity, Amortized cost, Within one year		15,013
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount		40,178
Held-to-maturity securities, Amortized cost	[2]	55,191	55,236
Asset-Backed Securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Debt securities, Available-for-sale, Estimated fair value, After five years through ten years	[1]	83,426
Debt securities, Available-for-sale, Estimated fair value, After ten years	[1]	373,004
Debt securities, Available-for-sale, Estimated fair value, Total	[1]	456,430
Debt securities, Held-to-maturity, Amortized cost, After ten years		177,523
Held-to-maturity securities, Amortized cost	[2]	$ 177,523	$ 177,335

[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.