Investment Securities AFS Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amortized cost and fair values of investment securities available for sale by contractual maturity
Securities available for sale, debt securities due in one year or less, amortized cost	$ 31,404
Securities available for sale, debt securities due after one year through five years, amortized cost	231,751
Securities available for sale, debt securities due after five years through ten years, amortized cost	429,242
Securities available for sale, debt securities due after ten years, amortized cost	23,055
Total available for sale debt securities, amortized cost	715,452
Investment securities available for sale, amortized cost	5,270,576	4,787,978
Securities available for sale, debt securities due in one year or less, fair value	31,503
Securities available for sale, debt securities due after one year through five years, fair value	240,398
Securities available for sale, debt securities due after five years through ten years, fair value	441,137
Securities available for sale, debt securities due after ten years, fair value	25,510
Total available for sale debt securities, Fair value	738,548
Investment securities available for sale, at fair value	5,250,585	4,926,758
Government-Sponsored Enterprise (GSE) Residential Mortgages [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Investment securities available for sale, amortized cost	3,855,467	3,708,287
Investment securities available for sale, at fair value	3,838,430	3,798,155
Private Label Residential Mortgages [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Investment securities available for sale, amortized cost	3,035	6,002
Investment securities available for sale, at fair value	3,014	6,149
GSE Commercial Mortgage-Related Securities [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Investment securities available for sale, amortized cost	673,555	226,420
Investment securities available for sale, at fair value	647,477	228,166
Asset-backed Securities [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Investment securities available for sale, amortized cost	23,049	0
Investment securities available for sale, at fair value	23,059	0
Equity Securities [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Investment securities available for sale, amortized cost	18
Investment securities available for sale, at fair value	$ 57

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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