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Repurchase Agreements (Tables) | 12 Months Ended
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Dec. 31, 2015
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 short-term borrowings in the Consolidated Balance Sheets as of December 31, 2015 and December 31, 2014 is presented in the following tables.
| December 31, 2015
| 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 | $ | 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 |
| December 31, 2014
| 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 | $ | 162,925 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,086 |  |  | $ | 186,011 |
Government agency | — |  |  | — |  |  | — |  |  | 6,914 |  |  | 6,914 |
Mortgage-backed securities | 131,501 |  |  | — |  |  | — |  |  | — |  |  | 131,501 |
Total borrowings | $ | 294,426 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,000 |  |  | $ | 324,426 |
Gross amount of recognized liabilities for repurchase agreements |  | $ | 324,426 |

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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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