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Securities Available-For-Sale (Comparative Summary Of Mortgage-Backed Securities And Other Securities Available-For-Sale) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 945,934	$ 1,244,777
Gross unrealized gains	10,464	31,048
Gross unrealized losses	19,313	194
Estimated fair value	937,085	1,275,631
Pass-through Certificates [Member] | GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	366,884	456,441
Gross unrealized gains	8,573	22,996
Gross unrealized losses	5,113	99
Estimated fair value	370,344	479,338
Real Estate Mortgage Investments Conduits (REMICs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	868,933	1,158,071
Gross unrealized gains	10,398	30,354
Gross unrealized losses	19,208	194
Estimated fair value	860,123	1,188,231
Real Estate Mortgage Investments Conduits (REMICs) [Member] | GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	497,575	694,087
Gross unrealized gains	1,699	7,092
Gross unrealized losses	14,047	62
Estimated fair value	485,227	701,117
Real Estate Mortgage Investments Conduits (REMICs) [Member] | Non-GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	4,474	7,543
Gross unrealized gains	126	266
Gross unrealized losses	48	33
Estimated fair value	4,552	7,776
Other Available For Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	77,001	86,706
Gross unrealized gains	66	694
Gross unrealized losses	105
Estimated fair value	76,962	87,400
Other Available For Sale Securities [Member] | Equity Investments-Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	510	12,998
Estimated fair value	510	12,998
Other Available For Sale Securities [Member] | Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	76,491	73,708
Gross unrealized gains	66	694
Gross unrealized losses	105
Estimated fair value	$ 76,452	$ 74,402

X

- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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