Investment Securities AFS contractual maturity table (Details) (USD $) In Thousands, unless otherwise specified	Mar. 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	$ 49,227
Securities available for sale, debt securities due after one year through five years, amortized cost	213,425
Securities available for sale, debt securities due after five years through ten years, amortized cost	506,121
Securities available for sale, debt securities due after ten years, amortized cost	49,518
Total available for sale debt securities, amortized cost	818,291
Securities available for sale, debt securities due in one year or less, fair value	49,808
Securities available for sale, debt securities due after one year through five years, fair value	222,878
Securities available for sale, debt securities due after five years through ten years, fair value	538,190
Securities available for sale, debt securities due after ten years, fair value	51,993
Total available for sale debt securities, Fair value	862,869
Investment securities available for sale, amortized cost	4,821,768	4,787,978
Investment securities available for sale, at fair value	4,950,317	4,926,758
Residential 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	3,704,596	3,714,289
Investment securities available for sale, at fair value	3,786,760	3,804,304
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	298,864	226,420
Investment securities available for sale, at fair value	300,639	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	17
Investment securities available for sale, at fair value	$ 49

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

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