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Fair Value - Unfunded Loan and Lease Commitments and Letters of Credit (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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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 | $ 6,700.0 | $ 6,100.0
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 | 6,700.0 | 6,100.0
Estimated fair value of unfunded loan and lease commitments and letters of credit | $ 46.6 | $ 42.3

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