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Fair Value - Unfunded Loan and Lease Commitments and Letters of Credit (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Unfunded loan and lease commitments and letters of credit |  |
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | $ 5,700.0 | $ 5,800.0
Level 3 |  |
Unfunded loan and lease commitments and letters of credit |  |
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | 5,700.0 | 5,800.0
Estimated fair value of unfunded loan and lease commitments and letters of credit | $ 13.8 | $ 14.2

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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