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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2021 $ 1.1
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 - 2025 0.2
Amount of Commitment Expiration by Period - Thereafter 15.4
Total Amounts Committed 17.3
Funding Commitments [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2021 1.0
Total Amounts Committed 1.0
Financial Guarantees [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2021 0.1
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 - 2025 0.2
Amount of Commitment Expiration by Period - Thereafter 0.2
Total Amounts Committed 1.1
Letters of Credit [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - Thereafter 15.2
Total Amounts Committed $ 15.2