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Investments (Tables) | 9 Months Ended
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Sep. 30, 2011
Investments [Abstract] |
Aggregate Values And Unrealized Gains And Losses Of Investment Securities |
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Investment securities available for sale |  |  |  |  |  |  |
September 30, 2011 |  |  |  |  |  |  |
U. S. Treasury | $ | 986,507 |  |  | $ | 1,427 |  |  | $ | — |  |  | $ | 987,934 |
Government agency | 2,261,000 |  |  | 2,344 |  |  | 2,435 |  |  | 2,260,909 |
Corporate bonds | 401,048 |  |  | 3,595 |  |  | — |  |  | 404,643 |
Residential mortgage-backed securities | 315,474 |  |  | 8,916 |  |  | 198 |  |  | 324,192 |
Equity securities | 939 |  |  | 15,165 |  |  | — |  |  | 16,104 |
State, county and municipal | 1,027 |  |  | 16 |  |  | — |  |  | 1,043 |
Total investment securities available for sale | $ | 3,965,995 |  |  | $ | 31,463 |  |  | $ | 2,633 |  |  | $ | 3,994,825 |
December 31, 2010 |  |  |  |  |  |  |
U. S. Treasury | $ | 1,935,666 |  |  | $ | 4,041 |  |  | $ | 307 |  |  | $ | 1,939,400 |
Government agency | 1,930,469 |  |  | 361 |  |  | 10,844 |  |  | 1,919,986 |
Corporate bonds | 479,160 |  |  | 7,498 |  |  | — |  |  | 486,658 |
Residential mortgage-backed securities | 139,291 |  |  | 4,522 |  |  | 268 |  |  | 143,545 |
Equity securities | 1,055 |  |  | 18,176 |  |  | — |  |  | 19,231 |
State, county and municipal | 1,240 |  |  | 20 |  |  | 4 |  |  | 1,256 |
Total investment securities available for sale | $ | 4,486,881 |  |  | $ | 34,618 |  |  | $ | 11,423 |  |  | $ | 4,510,076 |
September 30, 2010 |  |  |  |  |  |  |
U. S. Treasury | $ | 1,991,676 |  |  | $ | 7,259 |  |  | $ | — |  |  | $ | 1,998,935 |
Government agency | 1,120,476 |  |  | 1,840 |  |  | — |  |  | 1,122,316 |
Corporate bonds | 479,935 |  |  | 9,254 |  |  | — |  |  | 489,189 |
Residential mortgage-backed securities | 151,355 |  |  | 4,891 |  |  | 110 |  |  | 156,136 |
Equity securities | 1,132 |  |  | 17,865 |  |  | — |  |  | 18,997 |
State, county and municipal | 1,241 |  |  | 27 |  |  | — |  |  | 1,268 |
Total investment securities available for sale | $ | 3,745,815 |  |  | $ | 41,136 |  |  | $ | 110 |  |  | $ | 3,786,841 |
Investment securities held to maturity |  |  |  |  |  |  |
September 30, 2011 |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 1,943 |  |  | $ | 191 |  |  | $ | 26 |  |  | $ | 2,108 |
December 31, 2010 |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 2,532 |  |  | $ | 235 |  |  | $ | 26 |  |  | $ | 2,741 |
September 30, 2010 |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 2,645 |  |  | $ | 245 |  |  | $ | 26 |  |  | $ | 2,864 |
Investment Securities Maturity Information |
| September 30, 2011 |  | December 31, 2010 |  | September 30, 2010
| Cost |  | Fair Value |  | Cost |  | Fair Value |  | Cost |  | Fair Value
Investment securities available for sale |  |  |  |  |  |  |  |  |  |  |
Maturing in: |  |  |  |  |  |  |  |  |  |  |
One year or less | $ | 3,398,267 |  |  | $ | 3,401,530 |  |  | $ | 3,441,185 |  |  | $ | 3,436,818 |  |  | $ | 2,559,784 |  |  | $ | 2,567,076 |
One through five years | 289,046 |  |  | 291,064 |  |  | 916,101 |  |  | 921,536 |  |  | 1,044,757 |  |  | 1,056,170 |
Five through 10 years | 106,329 |  |  | 106,901 |  |  | 1,683 |  |  | 1,710 |  |  | 1,815 |  |  | 1,841 |
Over 10 years | 171,414 |  |  | 179,226 |  |  | 126,857 |  |  | 130,781 |  |  | 138,327 |  |  | 142,757 |
Equity securities | 939 |  |  | 16,104 |  |  | 1,055 |  |  | 19,231 |  |  | 1,132 |  |  | 18,997 |
Total investment securities available for sale | $ | 3,965,995 |  |  | $ | 3,994,825 |  |  | $ | 4,486,881 |  |  | $ | 4,510,076 |  |  | $ | 3,745,815 |  |  | $ | 3,786,841 |
Investment securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Maturing in: |  |  |  |  |  |  |  |  |  |  |
One through five years | $ | 13 |  |  | $ | 12 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Five through 10 years | 1,816 |  |  | 1,940 |  |  | 2,404 |  |  | 2,570 |  |  | 2,512 |  |  | 2,689 |
Over 10 years | 114 |  |  | 156 |  |  | 128 |  |  | 171 |  |  | 133 |  |  | 175 |
Total investment securities held to maturity | $ | 1,943 |  |  | $ | 2,108 |  |  | $ | 2,532 |  |  | $ | 2,741 |  |  | $ | 2,645 |  |  | $ | 2,864 |
Investment Securities With Unrealized Losses |
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
September 30, 2011 |  |  |  |  |  |  |  |  |  |  |
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |
Government agency | $ | 1,051,017 |  |  | $ | 2,435 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,051,017 |  |  | $ | 2,435 |
Residential mortgage-backed securities | 25,390 |  |  | 148 |  |  | 1,675 |  |  | 50 |  |  | 27,065 |  |  | 198 |
State, county and municipal | — |  |  | — |  |  | 425 |  |  | — |  |  | 425 |  |  | — |
Total | $ | 1,076,407 |  |  | $ | 2,583 |  |  | $ | 2,100 |  |  | $ | 50 |  |  | $ | 1,078,507 |  |  | $ | 2,633 |
Investment securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | — |  |  | $ | — |  |  | $ | 22 |  |  | $ | 26 |  |  | $ | 22 |  |  | $ | 26 |
September 30, 2010 |  |  |  |  |  |  |  |  |  |  |
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | 10,364 |  |  | 88 |  |  | 535 |  |  | 22 |  |  | 10,899 |  |  | 110 |
Investment securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | — |  |  | $ | — |  |  | $ | 27 |  |  | $ | 26 |  |  | $ | 27 |  |  | $ | 26 |
Securities Gains (Losses) |
| Three months ended September 30, |  | Nine months ended September 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
Gross gains on sales of investment securities available for sale | $ | 375 |  |  | $ | 1,167 |  |  | $ | 531 |  |  | $ | 3,803 |
Gross losses on sales of investment securities available for sale | (95 | ) |  | (1 | ) |  | (796 | ) |  | (1,506 | )
Other that temporary impairment loss on equity securities | (26 | ) |  | (226 | ) |  | (26 | ) |  | (412 | )
Total securities gains (losses) | $ | 254 |  |  | $ | 940 |  |  | $ | (291 | ) |  | $ | 1,885 |

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