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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2020 $ 2.2
Amount of Commitment Expiration by Period - 2021 0.2
Amount of Commitment Expiration by Period - 2022 0.2
Amount of Commitment Expiration by Period - 2023 0.2
Amount of Commitment Expiration by Period - 2024 0.2
Amount of Commitment Expiration by Period - Thereafter 18.6
Total Amounts Committed 21.6
Funding Commitments [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2020 2.1
Total Amounts Committed 2.1
Financial Guarantees [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2020 0.1
Amount of Commitment Expiration by Period - 2021 0.2
Amount of Commitment Expiration by Period - 2022 0.2
Amount of Commitment Expiration by Period - 2023 0.2
Amount of Commitment Expiration by Period - 2024 0.2
Amount of Commitment Expiration by Period - Thereafter 0.3
Total Amounts Committed 1.2
Letters of Credit [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - Thereafter 18.3
Total Amounts Committed $ 18.3