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Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
General settlement period of securities transactions | 3 days |
Fair value of securities accepted as collateral permitted to sell or repledge | $ 2,400.0 | $ 2,500.0
Fair value of collateral securities sold or repledged | 244.0 | 268.5
Outstanding commitments to originate loans | 213.2 | 205.8
Letters of credit outstanding | 90.2 | 88.9
Unused Lines Of Credit [Member] |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Unused lines of credit to commercial and consumer borrowers | $ 559.9 | $ 492.5
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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