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Investments (Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Mar. 31, 2011
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investment securities available for sale, less than 12 months, fair value | $ 2,752,137 | $ 2,172,701
Investment securities available for sale, 12 months or more, fair value | 1,123 | 472
Investment securities available for sale, total fair value | 2,753,260 | 2,173,173
Investment securities available for sale, less than 12 months, unrealized losses | 5,502 | 18,135
Investment securities available for sale, 12 months or more, unrealized losses | 35 | 29
Investment securities available for sale, total unrealized losses | 5,537 | 18,164
U. S. Treasury [Member] |  |
Schedule of Investments [Line Items] |  |
Investment securities available for sale, less than 12 months, fair value | 579,673 | 200,561
Investment securities available for sale, 12 months or more, fair value | 0 | 0
Investment securities available for sale, total fair value | 579,673 | 200,561
Investment securities available for sale, less than 12 months, unrealized losses | 305 | 234
Investment securities available for sale, 12 months or more, unrealized losses | 0 | 0
Investment securities available for sale, total unrealized losses | 305 | 234
Government Agency [Member] |  |
Schedule of Investments [Line Items] |  |
Investment securities available for sale, less than 12 months, fair value | 2,143,742 | 1,937,968
Investment securities available for sale, 12 months or more, fair value | 0 | 0
Investment securities available for sale, total fair value | 2,143,742 | 1,937,968
Investment securities available for sale, less than 12 months, unrealized losses | 5,040 | 17,394
Investment securities available for sale, 12 months or more, unrealized losses | 0 | 0
Investment securities available for sale, total unrealized losses | 5,040 | 17,394
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment securities available for sale, less than 12 months, fair value | 28,595 | 33,644
Investment securities available for sale, 12 months or more, fair value | 1,113 | 462
Investment securities available for sale, total fair value | 29,708 | 34,106
Investment securities available for sale, less than 12 months, unrealized losses | 156 | 503
Investment securities available for sale, 12 months or more, unrealized losses | 35 | 29
Investment securities available for sale, total unrealized losses | 191 | 532
Investment securities held to maturity, less than 12 months, fair value | 0 | 0
Investment securities held to maturity, 12 months or more, fair value | 20 | 19
Investment securities held to maturity, total fair value | 20 | 19
Investment securities held to maturity, less than 12 months, unrealized losses | 0 | 0
Investment securities held to maturity, 12 months or more, unrealized losses | 27 | 21
Investment securities held to maturity, total unrealized losses | 27 | 21
State, County and Municipal [Member] |  |
Schedule of Investments [Line Items] |  |
Investment securities available for sale, less than 12 months, fair value | 127 | 528
Investment securities available for sale, 12 months or more, fair value | 10 | 10
Investment securities available for sale, total fair value | 137 | 538
Investment securities available for sale, less than 12 months, unrealized losses | 1 | 4
Investment securities available for sale, 12 months or more, unrealized losses | 0 | 0
Investment securities available for sale, total unrealized losses | $ 1 | $ 4

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