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Offsetting Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Offsetting [Abstract] |  |
Fair value of financial instruments pledged against the repurchase agreements and other advances | $ 10,600.0 | $ 9,400.0
Fair value of securities pledged against the swaps | $ 2.3 | $ 2.7

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- Definition Fair value of securities pledged as collateral against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value of securities pledged as collateral against securities sold under agreement to repurchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant