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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes $ 25,977,000   $ 25,977,000   $ 17,400,000
Unrealized net loss recognized in other comprehensive income related to cash flow hedges     529,000    
Aggregate fair value of derivative financial instruments in asset position 381,000   381,000   314,000
Collateral relating to net asset positions 386,000   386,000   312,000
Clearinghouse Credit Facilities [Member]          
Derivative [Line Items]          
Amount of initial margin posted 143,000   143,000   205,000
Interest Income [Member]          
Derivative [Line Items]          
Changes in Cash Flow Hedges Derivative Instruments At Fair Value Net 173,000 $ 36,000 173,000 $ 36,000  
Change in Cash Flow Hedges Derivative Instruments At Fair Value Net 65,000 22,000      
Interest Rate Swap Agreements [Member]          
Derivative [Line Items]          
Increase decrease in net interest income due to interest rate swap agreements $ 79,000 $ 22,000 $ 211,000 $ 50,000  
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and Dividend Income, Operating Interest and Dividend Income, Operating Interest and Dividend Income, Operating Interest and Dividend Income, Operating  
Interest Rate Swap Agreements [Member] | Maturity Period 2024 [Member]          
Derivative [Line Items]          
Unrealized net loss recognized in other comprehensive income related to cash flow hedges     $ 13,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2025 [Member]          
Derivative [Line Items]          
Unrealized net loss recognized in other comprehensive income related to cash flow hedges     357,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2026 [Member]          
Derivative [Line Items]          
Unrealized net loss recognized in other comprehensive income related to cash flow hedges     159,000    
Interest Rate Contracts [Member]          
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes $ 44,200,000   44,200,000   45,100,000
Foreign Exchange and Other Option and Futures Contracts [Member]          
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes $ 1,500,000   $ 1,500,000   $ 1,700,000