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Repurchase Agreements (Tables) | 12 Months Ended
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Dec. 31, 2016
Repurchase Agreements [Abstract] |
Schedule of Repurchase Agreements [Table Text Block] | The remaining contractual maturity of the securities sold under agreements to repurchase by class of collateral pledged included in the Consolidated Balance Sheets as of December 31, 2016 and December 31, 2015 is presented in the following tables.
| December 31, 2016
| Remaining Contractual Maturity of the Agreements
(Dollars in thousands) | Overnight and continuous |  | Up to 30 Days |  | 30-90 Days |  | Greater than 90 Days |  | Total
Repurchase agreements |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 590,772 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,000 |  |  | $ | 620,772 |
Government agency | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total borrowings | $ | 590,772 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,000 |  |  | $ | 620,772 |
Gross amount of recognized liabilities for repurchase agreements |  | $ | 620,772 |
| December 31, 2015
| Remaining Contractual Maturity of the Agreements
| Overnight and continuous |  | Up to 30 Days |  | 30-90 Days |  | Greater than 90 Days |  | Total
Repurchase agreements |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 592,182 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,724 |  |  | $ | 617,906 |
Government agency | — |  |  | — |  |  | — |  |  | 4,276 |  |  | 4,276 |
Total borrowings | $ | 592,182 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,000 |  |  | $ | 622,182 |
Gross amount of recognized liabilities for repurchase agreements |  | $ | 622,182 |

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- Definition Repurchase Agreements [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for repurchase agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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