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Investments (Tables) | 12 Months Ended
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Dec. 31, 2013
Investments [Abstract] |
Aggregate Values And Unrealized Gains And Losses Of Investment Securities | Investment securities as of December 31, 2013, and 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
| (dollars in thousands)
Investment securities available for sale |  |  |  |  |  |  |
December 31, 2013 |  |  |  |  |  |  |
U.S. Treasury | $ | 373,223 |  |  | $ | 259 |  |  | $ | 45 |  |  | $ | 373,437 |
Government agency | 2,543,223 |  |  | 1,798 |  |  | 792 |  |  | 2,544,229 |
Mortgage-backed securities | 2,486,297 |  |  | 4,526 |  |  | 43,950 |  |  | 2,446,873 |
Equity securities | 543 |  |  | 21,604 |  |  | — |  |  | 22,147 |
State, county and municipal | 186 |  |  | 1 |  |  | — |  |  | 187 |
Other | 863 |  |  | — |  |  | 33 |  |  | 830 |
Total investment securities available for sale | $ | 5,404,335 |  |  | $ | 28,188 |  |  | $ | 44,820 |  |  | $ | 5,387,703 |
December 31, 2012 |  |  |  |  |  |  |
U.S. Treasury | $ | 823,241 |  |  | $ | 403 |  |  | $ | 12 |  |  | $ | 823,632 |
Government agency | 3,052,040 |  |  | 3,501 |  |  | 337 |  |  | 3,055,204 |
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 |
Investment securities held to maturity |  |  |  |  |  |  |
December 31, 2013 |  |  |  |  |  |  |
Mortgage-backed securities | $ | 907 |  |  | $ | 67 |  |  | $ | — |  |  | $ | 974 |
December 31, 2012 |  |  |  |  |  |  |
Mortgage-backed securities | $ | 1,342 |  |  | $ | 133 |  |  | $ | 27 |  |  | $ | 1,448 |
Investment Securities Maturity Information | The following table provides the maturity distribution of amortizing investment securities. Repayments of mortgage-backed securities are dependent on the underlying loan balances. Equity securities do not have a stated maturity date.
| December 31, 2013 |  | December 31, 2012
| Cost |  | Fair value |  | Cost |  | Fair value
| (dollars in thousands)
Investment securities available for sale |  |  |  |  |  |  |
Amortizing securities maturing in: |  |  |  |  |  |  |
One year or less | $ | 839,956 |  |  | $ | 840,883 |  |  | $ | 2,285,159 |  |  | $ | 2,286,403 |
One through five years | 2,077,539 |  |  | 2,077,800 |  |  | 1,590,608 |  |  | 1,592,923 |
Five through 10 years | — |  |  | — |  |  | 898 |  |  | 880 |
Mortgage-backed securities | 2,486,297 |  |  | 2,446,873 |  |  | 1,315,211 |  |  | 1,329,657 |
Equity securities | 543 |  |  | 22,147 |  |  | 543 |  |  | 16,365 |
Total investment securities available for sale | $ | 5,404,335 |  |  | $ | 5,387,703 |  |  | $ | 5,192,419 |  |  | $ | 5,226,228 |
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities held to maturity | $ | 907 |  |  | $ | 974 |  |  | $ | 1,342 |  |  | $ | 1,448 |
Securities Gains (Losses) | For each period presented, securities gains (losses) include the following:
| Year ended December 31
| 2013 |  | 2012 |  | 2011
| (dollars in thousands)
Gross gains on sales of investment securities available for sale | $ | — |  |  | $ | 2,324 |  |  | $ | 531 |
Gross losses on sales of investment securities available for sale | — |  |  | (2 | ) |  | (793 | )
Other than temporary impairment loss on equity securities | — |  |  | (45 | ) |  | (26 | )
Total securities gains (losses) | $ | — |  |  | $ | 2,277 |  |  | $ | (288 | )
Investment Securities With Unrealized Losses | The following table provides information regarding securities with unrealized losses as of December 31, 2013, and 2012.
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (dollars in thousands)
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 102,105 |  |  | $ | 45 |  |  | $ | — |  |  | $ | — |  |  | $ | 102,105 |  |  | $ | 45 |
Government agency | 780,552 |  |  | 761 |  |  | 29,969 |  |  | 31 |  |  | 810,521 |  |  | 792 |
Mortgage-backed securities | 2,221,213 |  |  | 42,876 |  |  | 26,861 |  |  | 1,074 |  |  | 2,248,074 |  |  | 43,950 |
Other | 830 |  |  | 33 |  |  | — |  |  | — |  |  | 830 |  |  | 33 |
Total | $ | 3,104,700 |  |  | $ | 43,715 |  |  | $ | 56,830 |  |  | $ | 1,105 |  |  | $ | 3,161,530 |  |  | $ | 44,820 |
Investment securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
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 |
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: |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | — |  |  | $ | — |  |  | $ | 17 |  |  | $ | 27 |  |  | $ | 17 |  |  | $ | 27 |

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