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Derivative and Hedging Activities - Narrative (Details) | Sep. 30, 2018 USD ($) counterparty Derivatives | Dec. 31, 2017 USD ($) Derivatives
--- | --- | ---
Derivative [Line Items] |  |
Number of interest rate derivatives held | Derivatives | 0 | 0
Cash collateral balances for derivatives | $ | $ 0 | $ 0
Expected amount to be transferred of during the next 12 months | $ | $ 35,000,000 |
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, number of instruments held | Derivatives | 0 | 0
Credit Risk [Member] |  |
Derivative [Line Items] |  |
Number of counterparties in hedge facility | counterparty | 11 |

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- Definition Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),2) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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