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Securities Sold Under Agreements to Repurchase - Schedule of Assets and Liabilities Subject to an Enforceable Master Netting Arrangement or Repurchase Agreements (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Interest Rate Swap Agreements |  |
Offsetting Assets And Liabilities [Line Items] |  |
Fair value of investment securities pledged | $ 50.4 | $ 58.3
Private Institutions |  |
Offsetting Assets And Liabilities [Line Items] |  |
Fair value of investment securities pledged | 508.2 | 523.4
Government Entities |  |
Offsetting Assets And Liabilities [Line Items] |  |
Fair value of investment securities pledged | $ 1.1 | $ 1.3

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- Definition Fair value of securities pledged as collateral against securities sold under agreement to repurchase. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313 + Details
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