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Investments (Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
Investment securities available for sale: |  |  |
Less than 12 months, fair value | $ 924,252 | $ 664,243 | $ 2,752,137
12 months or more, fair value | 10,089 | 9,433 | 1,123
Total fair value | 934,341 | 673,676 | 2,753,260
Less than 12 months, unrealized losses | 1,671 | 581 | 5,502
12 months or more, unrealized losses | 133 | 127 | 35
Total unrealized losses | 1,804 | 708 | 5,537
U. S. Treasury |  |  |
Investment securities available for sale: |  |  |
Less than 12 months, fair value | 25,060 | 120,045 | 579,673
12 months or more, fair value | 0 | 0 | 0
Total fair value | 25,060 | 120,045 | 579,673
Less than 12 months, unrealized losses | 1 | 12 | 305
12 months or more, unrealized losses | 0 | 0 | 0
Total unrealized losses | 1 | 12 | 305
Government Agency |  |  |
Investment securities available for sale: |  |  |
Less than 12 months, fair value | 548,618 | 407,498 | 2,143,742
12 months or more, fair value | 0 | 0 | 0
Total fair value | 548,618 | 407,498 | 2,143,742
Less than 12 months, unrealized losses | 274 | 337 | 5,040
12 months or more, unrealized losses | 0 | 0 | 0
Total unrealized losses | 274 | 337 | 5,040
Residential Mortgage-Backed Securities |  |  |
Investment securities available for sale: |  |  |
Less than 12 months, fair value | 349,746 | 135,880 | 28,595
12 months or more, fair value | 10,089 | 9,433 | 1,113
Total fair value | 359,835 | 145,313 | 29,708
Less than 12 months, unrealized losses | 1,379 | 214 | 156
12 months or more, unrealized losses | 133 | 127 | 35
Total unrealized losses | 1,512 | 341 | 191
Investment securities held to maturity: |  |  |
Less than 12 months, fair value | 0 | 0 | 0
Less than 12 months, unrealized losses | 0 | 0 | 0
12 months or more, fair value | 16 | 17 | 20
12 months or more, unrealized losses | 27 | 27 | 27
Total fair value | 16 | 17 | 20
Total unrealized losses | 27 | 27 | 27
Other Debt Obligations |  |  |
Investment securities available for sale: |  |  |
Less than 12 months, fair value | 828 | 820 |
12 months or more, fair value | 0 | 0 |
Total fair value | 828 | 820 |
Less than 12 months, unrealized losses | 17 | 18 |
12 months or more, unrealized losses | 0 | 0 |
Total unrealized losses | 17 | 18 |
State, County and Municipal |  |  |
Investment securities available for sale: |  |  |
Less than 12 months, fair value |  |  | 127
12 months or more, fair value |  |  | 10
Total fair value |  |  | 137
Less than 12 months, unrealized losses |  |  | 1
12 months or more, unrealized losses |  |  | 0
Total unrealized losses |  |  | $ 1

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