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Securities (Comparative Summary of Mortgage-Backed Securities and Other Securities Available-for-Sale) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,025,246	$ 1,244,777
Gross unrealized gains	11,965	31,048
Gross unrealized losses	14,156	194
Estimated fair value	1,023,055	1,275,631
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	912,112	1,158,071
Gross unrealized gains	11,962	30,354
Gross unrealized losses	13,848	194
Estimated fair value	910,226	1,188,231
Pass-through Certificates [Member] | GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	385,973	456,441
Gross unrealized gains	10,773	22,996
Gross unrealized losses	3,541	99
Estimated fair value	393,205	479,338
Real Estate Mortgage Investments Conduits (REMICs) [Member] | Non-GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,007	7,543
Gross unrealized gains	146	266
Gross unrealized losses	53	33
Estimated fair value	5,100	7,776
Real Estate Mortgage Investments Conduits (REMICs) [Member] | GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	521,132	694,087
Gross unrealized gains	1,043	7,092
Gross unrealized losses	10,254	62
Estimated fair value	511,921	701,117
Other Available For Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	113,134	86,706
Gross unrealized gains	3	694
Gross unrealized losses	308
Estimated fair value	112,829	87,400
Other Available For Sale Securities [Member] | GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	30,495
Gross unrealized losses	134
Estimated fair value	30,361
Other Available For Sale Securities [Member] | Equity Investments-Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,189	12,998
Estimated fair value	2,189	12,998
Other Available For Sale Securities [Member] | Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	80,450	73,708
Gross unrealized gains	3	694
Gross unrealized losses	174
Estimated fair value	$ 80,279	$ 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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