Investment Securities AFS amort cost and FV (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
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	$ 49,605
Securities available for sale, debt securities due after one year through five years, amortized cost	215,006
Securities available for sale, debt securities due after five years through ten years, amortized cost	522,815
Securities available for sale, debt securities due after ten years, amortized cost	59,826
Total available for sale debt securities, amortized cost	847,252
Investment securities available for sale, amortized cost	4,787,978	4,775,400
Securities available for sale, debt securities due in one year or less, fair value	48,477
Securities available for sale, debt securities due after one year through five years, fair value	223,764
Securities available for sale, debt securities due after five years through ten years, fair value	557,001
Securities available for sale, debt securities due after ten years, fair value	64,995
Total available for sale debt securities, Fair value	894,237
Investment securities available for sale, at fair value	4,926,758	4,937,483
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	3,714,289	3,674,696
Investment securities available for sale, at fair value	3,804,304	3,785,590
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	226,420	16,647
Investment securities available for sale, at fair value	228,166	18,543
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		188,439
Investment securities available for sale, at fair value		187,732
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	$ 51

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

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