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Investments (Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 3,104,700 | $ 664,243
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 43,715 | 581
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 44,820 | 708
12 months or more, fair value | 56,830 | 9,433
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments | 1,105 | 127
Total fair value | 3,161,530 | 673,676
U. S. Treasury |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 102,105 | 120,045
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 45 | 12
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 45 | 12
12 months or more, fair value | 0 | 0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments | 0 | 0
Total fair value | 102,105 | 120,045
Government Agency |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 780,552 | 407,498
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 761 | 337
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 792 | 337
12 months or more, fair value | 29,969 | 0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments | 31 | 0
Total fair value | 810,521 | 407,498
Mortgage Backed Securities, Other [Member] |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 2,221,213 | 135,880
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 42,876 | 214
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 43,950 | 341
12 months or more, fair value | 26,861 | 9,433
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments | 1,074 | 127
Total fair value | 2,248,074 | 145,313
Investment securities held to maturity: |  |
Less than 12 months, fair value | 0 | 0
Held-to-maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss | 0 | 0
12 months or more, fair value | 0 | 17
Held-to-maturity Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss | 0 | 27
Total fair value | 0 | 17
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 27
Other Debt Obligations |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 830 | 820
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments | 33 | 18
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 33 | 18
12 months or more, fair value | 0 | 0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments | 0 | 0
Total fair value | 830 | 820
State, County and Municipal |  |
Investment securities available for sale: |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 0 | $ 0

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