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Repurchase Agreements Repurchase Agreements (Tables) | 3 Months Ended
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Mar. 31, 2017
Repurchase Agreements [Abstract] |
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block] |
| March 31, 2017
| Remaining Contractual Maturity of the Agreements
| Overnight and Continuous |  | Up to 30 Days |  | 30-90 Days |  | Greater than 90 Days |  | Total
| (Dollars in thousands)
Sources of collateral |
U.S. government agency securities | $ | 16,762 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 16,762 |
Agency mortgage-backed securities | 56,837 |  |  | — |  |  | — |  |  | — |  |  | 56,837 |
Agency collateralized mortgage obligations | 72,173 |  |  | — |  |  | — |  |  | — |  |  | 72,173 |
Total borrowings | $ | 145,772 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 145,772 |
| December 31, 2016
| Remaining Contractual Maturity of the Agreements
| Overnight and Continuous |  | Up to 30 Days |  | 30-90 Days |  | Greater than 90 Days |  | Total
| (Dollars in thousands)
Sources of Collateral |
U.S. government agency securities | $ | 20,233 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 20,233 |
Agency mortgage-backed securities | 79,079 |  |  | — |  |  | — |  |  | — |  |  | 79,079 |
Agency collateralized mortgage obligations | 77,601 |  |  | — |  |  | — |  |  | — |  |  | 77,601 |
Total borrowings | $ | 176,913 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 176,913 |

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- Definition Repurchase Agreements [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure, as of the most recent balance sheet date, of securities or other assets sold under repurchase agreements when this amount exceeds 10 percent of total assets. Disclosure may include the following: the type of securities or assets sold under agreements to repurchase, the carrying amount, market value (including accrued interest plus any cash or other assets on deposit. The information is segregated into securities maturing (1) overnight; (2) term up to 30 days; (3) term of 30 to 90 days; (4) term over 90 days; (5) demand. + 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)(i)(A)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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