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Investments (Tables) | 3 Months Ended
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Mar. 31, 2014
Investments [Abstract] |
Aggregate Values And Unrealized Gains And Losses Of Investment Securities | The amortized cost and fair value of investment securities classified as available for sale and held to maturity at March 31, 2014 and December 31, 2013, are as follows:
| March 31, 2014
(Dollars in thousands) | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,274,716 |  |  | $ | 379 |  |  | $ | 1,874 |  |  | $ | 1,273,221 |
Government agency | 1,811,889 |  |  | 1,764 |  |  | 879 |  |  | 1,812,774 |
Mortgage-backed securities | 2,592,766 |  |  | 5,524 |  |  | 31,624 |  |  | 2,566,666 |
Equity securities | 543 |  |  | 22,017 |  |  | — |  |  | 22,560 |
Municipal securities | 186 |  |  | — |  |  | — |  |  | 186 |
Other | 870 |  |  | — |  |  | 40 |  |  | 830 |
Total investment securities available for sale | $ | 5,680,970 |  |  | $ | 29,684 |  |  | $ | 34,417 |  |  | $ | 5,676,237 |
| December 31, 2013
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
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 |
Municipal securities | 186 |  |  | 1 |  |  | — |  |  | 187 |
Other | 863 |  |  | — |  |  | 33 |  |  | 830 |
Total investment securities available for sale | $ | 5,404,335 |  |  | $ | 28,188 |  |  | $ | 44,820 |  |  | $ | 5,387,703 |
| March 31, 2014
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | $ | 782 |  |  | $ | 53 |  |  | $ | — |  |  | $ | 835 |
| December 31, 2013
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Mortgage-backed securities | $ | 907 |  |  | $ | 67 |  |  | $ | — |  |  | $ | 974 |
Investment Securities Maturity Information | The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Repayments of mortgage-backed securities are dependent on the repayments of the underlying loan balances. Equity securities do not have a stated maturity date.
| March 31, 2014 |  | December 31, 2013
(Dollars in thousands) | Cost |  | Fair value |  | Cost |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
Amortizing securities maturing in: |  |  |  |  |  |  |
One year or less | $ | 829,091 |  |  | $ | 829,997 |  |  | $ | 839,956 |  |  | $ | 840,883 |
One through five years | 2,258,570 |  |  | 2,257,014 |  |  | 2,077,539 |  |  | 2,077,800 |
Mortgage-backed securities | 2,592,766 |  |  | 2,566,666 |  |  | 2,486,297 |  |  | 2,446,873 |
Equity securities | 543 |  |  | 22,560 |  |  | 543 |  |  | 22,147 |
Total investment securities available for sale | $ | 5,680,970 |  |  | $ | 5,676,237 |  |  | $ | 5,404,335 |  |  | $ | 5,387,703 |
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities held to maturity | $ | 782 |  |  | $ | 835 |  |  | $ | 907 |  |  | $ | 974 |
Securities Gains (Losses) | There were no realized securities gains (losses) during any period presented.
Investment Securities With Unrealized Losses | The following table provides information regarding securities with unrealized losses as of March 31, 2014 and December 31, 2013.
| March 31, 2014
| Less than 12 months |  | 12 months or more |  | Total
(Dollars in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 699,985 |  |  | $ | 1,874 |  |  | $ | — |  |  | $ | — |  |  | $ | 699,985 |  |  | $ | 1,874 |
Government agency | 400,423 |  |  | 879 |  |  | — |  |  | — |  |  | 400,423 |  |  | 879 |
Mortgage-backed securities | 2,012,814 |  |  | 30,816 |  |  | 23,622 |  |  | 808 |  |  | 2,036,436 |  |  | 31,624 |
Other | 830 |  |  | 40 |  |  | — |  |  | — |  |  | 830 |  |  | 40 |
Total | $ | 3,114,052 |  |  | $ | 33,609 |  |  | $ | 23,622 |  |  | $ | 808 |  |  | $ | 3,137,674 |  |  | $ | 34,417 |
| December 31, 2013
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
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 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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