Fair Value Measurements - Valuation Techniques, Significant Unobservable Inputs, Quantitative Information Non-recurring Basis (Detail) - Discount factor applied to real estate collateral-dependent loans to reflect realizable value - Fair Value, Measurements, Nonrecurring - LEVEL 3 $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
INPUT VALUES	0.020	0.172
Lower Limit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
INPUT VALUES	0.000	0.150
Upper Limit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
INPUT VALUES	0.200	0.200
Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
FAIR VALUE	$ 43.3	$ 6.6