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Borrowings - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Debt Maturity, Start Year Jan. 01, 2027  
Debt Maturity, End Year Dec. 31, 2033  
Minimum [Member]    
Debt Instrument [Line Items]    
Variable interest rate of Senior Notes /Junior Subordinated Debentures 0.98% 1.06%
Maximum [Member]    
Debt Instrument [Line Items]    
Variable interest rate of Senior Notes /Junior Subordinated Debentures 3.47% 3.59%
FHLBs Facility [Member]    
Debt Instrument [Line Items]    
Borrowing facilities available with FHLB's amount $ 16,200,000,000  
Federal Reserve Bank of New York [Member]    
Debt Instrument [Line Items]    
Line of credit facility $ 13,800,000,000  
Senior Notes Issued in July 2018 [Member]    
Debt Instrument [Line Items]    
Variable interest rate of Senior Notes /Junior Subordinated Debentures 0.81% 0.90%
Variable Rate Senior Notes [Member]    
Debt Instrument [Line Items]    
Weighted-average variable rates payable 0.71% 0.63%
Variable Rate Senior Notes [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Variable interest rate of Senior Notes /Junior Subordinated Debentures 0.61% 0.49%
Variable Rate Senior Notes [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Variable interest rate of Senior Notes /Junior Subordinated Debentures 0.81% 0.83%
Long Term Fixed Rate Advances From Fhlb    
Debt Instrument [Line Items]    
Advances from the FHLB earliest maturity date 2029  
Advances from the FHLB latest maturity date, 2035  
Long Term Fixed Rate Advances From Fhlb | Weighted Average [Member]    
Debt Instrument [Line Items]    
Variable contractual interest rate of long-term debt 5.82% 5.82%
Subordinated Capital Notes [Member]    
Debt Instrument [Line Items]    
Interest rate of debt instrument   0.87%
Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Weighted-average variable rates payable 1.53% 1.65%
Short-term Borrowings [Member]    
Debt Instrument [Line Items]    
Stated maturity 1 year