Investment Securities AFS Contractual Maturity Table (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 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	$ 51,411
Securities available for sale, debt securities due after one year through five years, amortized cost	218,135
Securities available for sale, debt securities due after five years through ten years, amortized cost	481,965
Securities available for sale, debt securities due after ten years, amortized cost	35,122
Total available for sale debt securities, amortized cost	786,633
Securities available for sale, debt securities due in one year or less, fair value	51,364
Securities available for sale, debt securities due after one year through five years, fair value	226,577
Securities available for sale, debt securities due after five years through ten years, fair value	500,463
Securities available for sale, debt securities due after ten years, fair value	36,149
Total available for sale debt securities, Fair value	814,553
Investment securities available for sale, amortized cost	4,837,633	4,787,978
Investment securities available for sale, at fair value	4,854,319	4,926,758
Government-Sponsored Enterprise (GSE) [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Investment securities available for sale, amortized cost	3,600,772	3,708,287
Investment securities available for sale, at fair value	3,605,030	3,798,155
Private Label [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Investment securities available for sale, amortized cost	3,403	6,002
Investment securities available for sale, at fair value	3,439	6,149
Commercial Mortgage Backed Securities [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Investment securities available for sale, amortized cost	446,807	226,420
Investment securities available for sale, at fair value	431,252	228,166
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	$ 45

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

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