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Securities Available-for-Sale - Additional Information (Details) $ in Millions | Sep. 30, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
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Schedule of Available-for-sale Securities [Line Items] |  |
Number of securities in unrealized loss position | 31 | 31
Securities pledged for regulatory and legal requirements | $ | $ 274 | $ 342
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of securities in unrealized loss position | 31 | 31
Marketable equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of securities in unrealized loss position | 0 | 0

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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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