Other-Than-Temporary Impairment (OTTI Securities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012
Other than Temporary Impairment, Disclosure [Line Items]
Unpaid Principal Balance	$ 1,807,959
Private label MBS [Member]
Other than Temporary Impairment, Disclosure [Line Items]
Unpaid Principal Balance	1,807,959	[1]
Amortized Cost	1,488,830	[1]
Fair Value	1,481,239
Available-for-sale Securities [Member] | Private label MBS [Member]
Other than Temporary Impairment, Disclosure [Line Items]
Unpaid Principal Balance	133,923
Unpaid Principal Balance	1,674,036
Amortized Cost	117,199	[2]
Amortized Cost	1,371,631
Fair Value	111,318
Fair Value	1,369,921
Unpaid Principal Balance	1,803,903
Unpaid Principal Balance	4,056
Amortized Cost	1,484,774	[2]
Amortized Cost	4,056
Fair Value	1,477,605
Fair Value	3,634
Available-for-sale Securities [Member] | Private label residential MBS [Member] | Prime [Member]
Other than Temporary Impairment, Disclosure [Line Items]
Unpaid Principal Balance	30,705
Amortized Cost	28,718	[2]
Fair Value	28,215
Unpaid Principal Balance	877,756
Amortized Cost	757,481	[2]
Fair Value	775,666
Available-for-sale Securities [Member] | Private label residential MBS [Member] | Alt-A [Member]
Other than Temporary Impairment, Disclosure [Line Items]
Unpaid Principal Balance	103,218
Amortized Cost	88,481	[2]
Fair Value	83,103
Unpaid Principal Balance	902,109
Amortized Cost	710,574	[2]
Fair Value	685,975
Available-for-sale Securities [Member] | Private label residential MBS [Member] | Subprime [Member]
Other than Temporary Impairment, Disclosure [Line Items]
Unpaid Principal Balance	0
Amortized Cost	0	[2]
Fair Value	0
Unpaid Principal Balance	2,446
Amortized Cost	1,375	[2]
Fair Value	1,389
Available-for-sale Securities [Member] | HELOCs [Member]
Other than Temporary Impairment, Disclosure [Line Items]
Unpaid Principal Balance	0
Amortized Cost	0	[2]
Fair Value	0
Unpaid Principal Balance	21,592
Amortized Cost	15,344	[2]
Fair Value	$ 14,575

[1] Amortized cost includes adjustments made to the cost basis of an investment for accretion and/or amortization, collection of cash, and/or previous OTTI recognized in earnings.

[2] Amortized cost includes adjustments made to the cost basis of an investment for accretion and/or amortization, collection of cash, and/or previous OTTI recognized in earnings.