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Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
General settlement period of securities transactions | 2 days |
Fair value of securities accepted as collateral permitted to sell or repledge | $ 2,600.0 | $ 2,400.0
Fair value of collateral securities sold or repledged | 514.3 | 233.7
Outstanding commitments to originate loans | 210.3 | 160.2
Letters of credit outstanding | 18.5 | 82.5
Unused Lines Of Credit [Member] |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Unused lines of credit to commercial and consumer borrowers | $ 695.5 | $ 590.5
Standby Letters of Credit [Member] | Maximum [Member] |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Letters of credit, expiration period | 1 year |

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- Definition Fair value as of the balance sheet date of customer securities accepted as collateral by the entity that it is permitted by contract or custom to sell or re-pledge to counterparties as collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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