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Investments (Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
--- | --- | --- | ---
Investment securities available for sale: |  |  |
Less than 12 months, fair value | $ 384,897 | $ 1,547,490 | $ 1,076,407
12 months or more, fair value | 5,782 | 1,390 | 2,100
Total fair value | 390,679 | 1,548,880 | 1,078,507
Less than 12 months, unrealized losses | 392 | 1,846 | 2,583
12 months or more, unrealized losses | 49 | 43 | 50
Total unrealized losses | 441 | 1,889 | 2,633
U. S. Treasury |  |  |
Investment securities available for sale: |  |  |
Less than 12 months, fair value | 195,444 | 151,269 |
12 months or more, fair value | 0 | 0 |
Total fair value | 195,444 | 151,269 |
Less than 12 months, unrealized losses | 30 | 30 |
12 months or more, unrealized losses | 0 | 0 |
Total unrealized losses | 30 | 30 |
Government Agency |  |  |
Investment securities available for sale: |  |  |
Less than 12 months, fair value | 135,927 | 1,336,763 | 1,051,017
12 months or more, fair value | 502 | 0 | 0
Total fair value | 136,429 | 1,336,763 | 1,051,017
Less than 12 months, unrealized losses | 78 | 1,512 | 2,435
12 months or more, unrealized losses | 0 | 0 | 0
Total unrealized losses | 78 | 1,512 | 2,435
Residential Mortgage-Backed Securities |  |  |
Investment securities available for sale: |  |  |
Less than 12 months, fair value | 53,526 | 59,458 | 25,390
12 months or more, fair value | 5,280 | 1,380 | 1,675
Total fair value | 58,806 | 60,838 | 27,065
Less than 12 months, unrealized losses | 284 | 304 | 148
12 months or more, unrealized losses | 49 | 42 | 50
Total unrealized losses | 333 | 346 | 198
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 | 18 | 21 | 22
12 months or more, unrealized losses | 27 | 26 | 26
Total fair value | 18 | 21 | 22
Total unrealized losses | 27 | 26 | 26
State, County and Municipal |  |  |
Investment securities available for sale: |  |  |
Less than 12 months, fair value |  | 0 | 0
12 months or more, fair value |  | 10 | 425
Total fair value |  | 10 | 425
Less than 12 months, unrealized losses |  | 0 | 0
12 months or more, unrealized losses |  | 1 | 0
Total unrealized losses |  | $ 1 | $ 0

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