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Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements - Recently Issued or Adopted Accounting Pronouncements (Details)
$ in Millions
Jan. 01, 2020
USD ($)
Accounting Standards Update 2016-13  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Pretax cumulative effect adjustment $ 7.1
Cumulative Effect Of New Accounting Principle In Period Of Adoption Net of Tax 5.6
Total Allowance for Credit Losses  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Impact of CECL Adoption 3.4
Unused Commitments to Extend Credit  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Impact of CECL Adoption $ 3.7