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Investments (Tables) | 9 Months Ended
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Sep. 30, 2015
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 September 30, 2015 and December 31, 2014, are as follows:
| September 30, 2015
(Dollars in thousands) | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,685,794 |  |  | $ | 5,708 |  |  | $ | — |  |  | $ | 1,691,502 |
Government agency | 633,162 |  |  | 1,742 |  |  | — |  |  | 634,904 |
Mortgage-backed securities | 4,343,105 |  |  | 26,375 |  |  | 6,919 |  |  | 4,362,561 |
Equity securities | 1,591 |  |  | 20 |  |  | — |  |  | 1,611 |
Total investment securities available for sale | $ | 6,663,652 |  |  | $ | 33,845 |  |  | $ | 6,919 |  |  | $ | 6,690,578 |
| December 31, 2014
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
U.S. Treasury | $ | 2,626,900 |  |  | $ | 2,922 |  |  | $ | 152 |  |  | $ | 2,629,670 |
Government agency | 908,362 |  |  | 702 |  |  | 247 |  |  | 908,817 |
Mortgage-backed securities | 3,628,187 |  |  | 16,964 |  |  | 11,847 |  |  | 3,633,304 |
Municipal securities | 125 |  |  | 1 |  |  | — |  |  | 126 |
Total investment securities available for sale | $ | 7,163,574 |  |  | $ | 20,589 |  |  | $ | 12,246 |  |  | $ | 7,171,917 |
| September 30, 2015
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | $ | 301 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 314 |
| December 31, 2014
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Mortgage-backed securities | $ | 518 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 544 |
Investment Securities Maturity Information | The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities on certain securities 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.
| September 30, 2015 |  | December 31, 2014
(Dollars in thousands) | Cost |  | Fair value |  | Cost |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
Non-amortizing securities maturing in: |  |  |  |  |  |  |
One year or less | $ | 673,879 |  |  | $ | 675,164 |  |  | $ | 447,866 |  |  | $ | 447,992 |
One through five years | 1,645,077 |  |  | 1,651,242 |  |  | 3,087,521 |  |  | 3,090,621 |
Mortgage-backed securities | 4,343,105 |  |  | 4,362,561 |  |  | 3,628,187 |  |  | 3,633,304 |
Equity securities | 1,591 |  |  | 1,611 |  |  | — |  |  | — |
Total investment securities available for sale | $ | 6,663,652 |  |  | $ | 6,690,578 |  |  | $ | 7,163,574 |  |  | $ | 7,171,917 |
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities held to maturity | $ | 301 |  |  | $ | 314 |  |  | $ | 518 |  |  | $ | 544 |
Securities Gains (Losses) | For each period presented, securities gains (losses) included the following:
| Three months ended September 30 |  | Nine months ended September 30
(Dollars in thousands) | 2015 |  | 2014 |  | 2015 |  | 2014
Gross gains on sales of investment securities available for sale | $ | 5,564 |  |  | $ | — |  |  | $ | 10,850 |  |  | $ | — |
Gross losses on sales of investment securities available for sale | — |  |  | — |  |  | (13 | ) |  | — |
Total net securities gain | $ | 5,564 |  |  | $ | — |  |  | $ | 10,837 |  |  | $ | — |
Investment Securities With Unrealized Losses | The following table provides information regarding securities with unrealized losses as of September 30, 2015 and December 31, 2014.
| September 30, 2015
| 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: |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | 911,980 |  |  | $ | 3,024 |  |  | $ | 300,157 |  |  | $ | 3,895 |  |  | $ | 1,212,137 |  |  | $ | 6,919 |
Total | $ | 911,980 |  |  | $ | 3,024 |  |  | $ | 300,157 |  |  | $ | 3,895 |  |  | $ | 1,212,137 |  |  | $ | 6,919 |
| December 31, 2014
| 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 | $ | 338,612 |  |  | $ | 151 |  |  | $ | 1,015 |  |  | $ | 1 |  |  | $ | 339,627 |  |  | $ | 152 |
Government agency | 261,288 |  |  | 247 |  |  | — |  |  | — |  |  | 261,288 |  |  | 247 |
Mortgage-backed securities | 573,374 |  |  | 1,805 |  |  | 831,405 |  |  | 10,042 |  |  | 1,404,779 |  |  | 11,847 |
Total | $ | 1,173,274 |  |  | $ | 2,203 |  |  | $ | 832,420 |  |  | $ | 10,043 |  |  | $ | 2,005,694 |  |  | $ | 12,246 |

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