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Short and Long-Term Funding (Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | $ 183,013,000 | $ 182,865,000
Overnight and Continuous |  |
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | 183,013,000 | 182,865,000
Up to 30 days |  |
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | 0 | 0
30-90 days |  |
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | 0 | 0
Greater than 90 days |  |
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | 0 | 0
Agency mortgage-related securities |  |
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | 183,013,000 | 182,865,000
Agency mortgage-related securities | Overnight and Continuous |  |
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | 183,013,000 | 182,865,000
Agency mortgage-related securities | Up to 30 days |  |
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | 0 | 0
Agency mortgage-related securities | 30-90 days |  |
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | 0 | 0
Agency mortgage-related securities | Greater than 90 days |  |
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] |  |
Repurchase agreements | $ 0 | $ 0

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- Definition [Line Items] for RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Table] + References No definition available. + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a financial asset repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same financial asset at a date certain for a specified price. Includes repurchase-to-maturity transactions and liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 + Details
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