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Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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 | $ 1,900.0 |  | $ 2,300.0
Fair value of collateral securities sold or repledged | 182.3 |  | 391.6
Outstanding commitments to originate loans | 1.0 |  | 384.5
Letters of credit outstanding | 31.1 |  | 38.3
Unfunded Commitment [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Expected credit losses | 21.2 |  |
Accounts Payable and Accrued Expenses [Member] | Unfunded Commitment [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Reserve for unfunded commitments |  | $ 20.4 |
Unused Lines Of Credit [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Unused lines of credit to commercial and consumer borrowers | $ 2,100.0 |  | $ 1,500.0
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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