| **Summary of Offsetting Assets and Liabilities - Netting Arrangements (Details) - USD ($) $ in Thousands**                                    | Jun. 30, 2018 | Dec. 31, 2017 |
|-----------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Financial instruments (assets):**                                                                                                           |          |          |
| Gross fair value of recognized assets                                                                                                         | $ 62,869      | $ 52,738      |
| Financial instruments                                                                                                                         | (50,356)      | (47,827)      |
| Cash collateral                                                                                                                               | (10,612)      | (4,911)       |
| Net fair value                                                                                                                                | 1,901         | 0             |
| Securities purchased under agreements to resell, gross                                                                                        |          | 23,200        |
| Securities purchased under agreements to resell, not offset                                                                                   |          | (23,200)      |
| Securities purchased under agreements to resell, collateral, obligation to return cash                                                        |          | 0             |
| Securities purchased under agreements to resell, offset against collateral, net of not subject to master netting arrangement, policy election |          | 0             |
| Derivative asset, securities purchased under agreements to resell, securities borrowed                                                        |          | 75,938        |
| Derivative asset, securities purchased under agreements to resell, securities borrowed, not offset                                            |          | (71,027)      |
| Derivative asset, securities purchased under agreements to resell, securities borrowed, collateral, obligation to return cash                 |          | (4,911)       |
| Derivative asset, securities purchased under agreements to resell, securities borrowed, amount offset against collateral                      |          | 0             |
| **Financial instruments (liabilities):**                                                                                                      |          |          |
| Gross fair value of recognized liabilities                                                                                                    | 73,550        | 93,761        |
| Financial instruments                                                                                                                         | (50,356)      | (47,827)      |
| Amount of unrestricted cash collateral to counterparties in the normal course of business                                                     | (16,310)      | (42,750)      |
| Net fair value                                                                                                                                | $ 6,884       | $ 3,184       |

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Amount, after effects of master netting arrangements, deduction of assets not subject to a master netting arrangement and elected not to be offset, of derivative assets, securities purchased under agreements to resell and securities borrowed, offset against an obligation to return collateral under a master netting arrangement.
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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.
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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
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Fair value, after effects of master netting arrangements, deduction of liabilities not subject to a master netting arrangement and elected not to be offset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, offset against the right to receive collateral.
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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against securities purchased under agreement to resell.
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Amount, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.
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Amount of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price, elected not to be offset, deducted from securities purchased under agreements to resell.
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