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Investments (Tables) | 3 Months Ended
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Mar. 31, 2013
Investments [Abstract] |
Aggregate Values And Unrealized Gains And Losses Of Investment Securities | The aggregate values of investment securities at March 31, 2013, December 31, 2012, and March 31, 2012, along with unrealized gains and losses determined on an individual security basis are as follows:
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
March 31, 2013 |  |  |  |  |  |  |
U. S. Treasury | $ | 749,284 |  |  | $ | 474 |  |  | $ | 1 |  |  | $ | 749,757 |
Government agency | 3,147,363 |  |  | 2,952 |  |  | 274 |  |  | 3,150,041 |
Residential mortgage-backed securities | 1,348,765 |  |  | 10,849 |  |  | 1,512 |  |  | 1,358,102 |
Equity securities | 543 |  |  | 19,860 |  |  | — |  |  | 20,403 |
State, county and municipal | 546 |  |  | 1 |  |  | — |  |  | 547 |
Other | 844 |  |  | 1 |  |  | 17 |  |  | 828 |
Total investment securities available for sale | $ | 5,247,345 |  |  | $ | 34,137 |  |  | $ | 1,804 |  |  | $ | 5,279,678 |
December 31, 2012 |  |  |  |  |  |  |
U. S. Treasury | $ | 823,241 |  |  | $ | 403 |  |  | $ | 12 |  |  | $ | 823,632 |
Government agency | 3,052,040 |  |  | 3,501 |  |  | 337 |  |  | 3,055,204 |
Residential mortgage-backed securities | 1,315,211 |  |  | 14,787 |  |  | 341 |  |  | 1,329,657 |
Equity securities | 543 |  |  | 15,822 |  |  | — |  |  | 16,365 |
State, county and municipal | 546 |  |  | 4 |  |  | — |  |  | 550 |
Other | 838 |  |  | — |  |  | 18 |  |  | 820 |
Total investment securities available for sale | $ | 5,192,419 |  |  | $ | 34,517 |  |  | $ | 708 |  |  | $ | 5,226,228 |
March 31, 2012 |  |  |  |  |  |  |
U. S. Treasury | $ | 1,065,035 |  |  | $ | 306 |  |  | $ | 305 |  |  | $ | 1,065,036 |
Government agency | 2,859,197 |  |  | 1,228 |  |  | 5,040 |  |  | 2,855,385 |
Corporate bonds | 225,214 |  |  | 1,214 |  |  | — |  |  | 226,428 |
Residential mortgage-backed securities | 282,706 |  |  | 8,393 |  |  | 191 |  |  | 290,908 |
Equity securities | 894 |  |  | 18,049 |  |  | — |  |  | 18,943 |
State, county and municipal | 1,026 |  |  | 14 |  |  | 1 |  |  | 1,039 |
Total investment securities available for sale | $ | 4,434,072 |  |  | $ | 29,204 |  |  | $ | 5,537 |  |  | $ | 4,457,739 |
Investment securities held to maturity |  |  |  |  |  |  |
March 31, 2013 |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 1,229 |  |  | $ | 120 |  |  | $ | 27 |  |  | $ | 1,322 |
December 31, 2012 |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 1,342 |  |  | $ | 133 |  |  | $ | 27 |  |  | $ | 1,448 |
March 31, 2012 |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 1,688 |  |  | $ | 183 |  |  | $ | 27 |  |  | $ | 1,844 |
Investment Securities Maturity Information | The following table provides the expected maturity distribution for residential mortgage-backed securities and the contractual maturity distribution of other investment securities as of the dates indicated. Callable securities are assumed to mature on their earliest call date.
| March 31, 2013 |  | December 31, 2012 |  | March 31, 2012
| Cost |  | Fair value |  | Cost |  | Fair value |  | Cost |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |  |  |  |  |
Maturing in: |  |  |  |  |  |  |  |  |  |  |
One year or less | $ | 2,350,896 |  |  | $ | 2,352,328 |  |  | $ | 2,288,556 |  |  | $ | 2,289,859 |  |  | $ | 2,750,247 |  |  | $ | 2,748,710 |
One through five years | 2,233,407 |  |  | 2,237,530 |  |  | 2,323,222 |  |  | 2,329,207 |  |  | 1,469,876 |  |  | 1,469,236 |
Five through 10 years | 181,370 |  |  | 182,281 |  |  | 194,398 |  |  | 196,371 |  |  | 67,229 |  |  | 67,683 |
Over 10 years | 481,129 |  |  | 487,136 |  |  | 385,700 |  |  | 394,426 |  |  | 145,826 |  |  | 153,167 |
Equity securities | 543 |  |  | 20,403 |  |  | 543 |  |  | 16,365 |  |  | 894 |  |  | 18,943 |
Total investment securities available for sale | $ | 5,247,345 |  |  | $ | 5,279,678 |  |  | $ | 5,192,419 |  |  | $ | 5,226,228 |  |  | $ | 4,434,072 |  |  | $ | 4,457,739 |
Investment securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Maturing in: |  |  |  |  |  |  |  |  |  |  |
One through five years | $ | 1,132 |  |  | $ | 1,188 |  |  | $ | 1,242 |  |  | $ | 1,309 |  |  | $ | 379 |  |  | $ | 393 |
Five through 10 years | 18 |  |  | 10 |  |  | 18 |  |  | 11 |  |  | 1,201 |  |  | 1,306 |
Over 10 years | 79 |  |  | 124 |  |  | 82 |  |  | 128 |  |  | 108 |  |  | 145 |
Total investment securities held to maturity | $ | 1,229 |  |  | $ | 1,322 |  |  | $ | 1,342 |  |  | $ | 1,448 |  |  | $ | 1,688 |  |  | $ | 1,844 |
Securities Gains (Losses) | For each period presented, securities gains (losses) include the following:
| Three months ended March 31
| 2013 |  | 2012
Gross gains on sales of investment securities available for sale | $ | 58 |  |  | $ | — |
Gross losses on sales of investment securities available for sale | — |  |  | — |
Other than temporary impairment loss on equity securities | — |  |  | (45 | )
Total securities gains (losses) | $ | 58 |  |  | $ | (45 | )
Investment Securities With Unrealized Losses | The following table provides information regarding securities with unrealized losses as of March 31, 2013, December 31, 2012, and March 31, 2012:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
March 31, 2013 |  |  |  |  |  |  |  |  |  |  |
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U. S. Treasury | $ | 25,060 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,060 |  |  | $ | 1 |
Government agency | 548,618 |  |  | 274 |  |  | — |  |  | — |  |  | 548,618 |  |  | 274 |
Residential mortgage-backed securities | 349,746 |  |  | 1,379 |  |  | 10,089 |  |  | 133 |  |  | 359,835 |  |  | 1,512 |
Other | 828 |  |  | 17 |  |  | — |  |  | — |  |  | 828 |  |  | 17 |
Total | $ | 924,252 |  |  | $ | 1,671 |  |  | $ | 10,089 |  |  | $ | 133 |  |  | $ | 934,341 |  |  | $ | 1,804 |
Investment securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | — |  |  | $ | — |  |  | $ | 16 |  |  | $ | 27 |  |  | $ | 16 |  |  | $ | 27 |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U. S. Treasury | $ | 120,045 |  |  | $ | 12 |  |  | $ | — |  |  | $ | — |  |  | $ | 120,045 |  |  | $ | 12 |
Government agency | 407,498 |  |  | 337 |  |  | — |  |  | — |  |  | 407,498 |  |  | 337 |
Residential mortgage-backed securities | 135,880 |  |  | 214 |  |  | 9,433 |  |  | 127 |  |  | 145,313 |  |  | 341 |
Other | 820 |  |  | 18 |  |  | — |  |  | — |  |  | 820 |  |  | 18 |
Total | $ | 664,243 |  |  | $ | 581 |  |  | $ | 9,433 |  |  | $ | 127 |  |  | $ | 673,676 |  |  | $ | 708 |
Investment securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | — |  |  | $ | — |  |  | $ | 17 |  |  | $ | 27 |  |  | $ | 17 |  |  | $ | 27 |
March 31, 2012 |  |  |  |  |  |  |  |  |  |  |
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 579,673 |  |  | $ | 305 |  |  | $ | — |  |  | $ | — |  |  | $ | 579,673 |  |  | $ | 305 |
Government agency | 2,143,742 |  |  | 5,040 |  |  | — |  |  | — |  |  | 2,143,742 |  |  | 5,040 |
Residential mortgage-backed securities | 28,595 |  |  | 156 |  |  | 1,113 |  |  | 35 |  |  | 29,708 |  |  | 191 |
State, county and municipal | 127 |  |  | 1 |  |  | 10 |  |  | — |  |  | 137 |  |  | 1 |
Total | $ | 2,752,137 |  |  | $ | 5,502 |  |  | $ | 1,123 |  |  | $ | 35 |  |  | $ | 2,753,260 |  |  | $ | 5,537 |
Investment securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | — |  |  | $ | — |  |  | $ | 20 |  |  | $ | 27 |  |  | $ | 20 |  |  | $ | 27 |

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