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Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets [Abstract]        
Trading securities $ 4,464,161 $ 9,136,813    
Available for sale securities 11,493,860 13,157,817    
Fair value option securities 296,590 43,770    
Mortgage servicing rights 277,608 163,198 $ 101,172 $ 201,886
Derivative contracts, net of cash margin, Assets, Fair Value 880,343 1,097,297    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value 554,900 275,625    
U.S. government securities [Member]        
Assets [Abstract]        
Trading securities 9,823 23,610    
Residential agency mortgage-backed securities [Member]        
Assets [Abstract]        
Trading securities 4,406,848 9,068,900    
Available for sale securities 5,814,496 8,006,616    
Fair value option securities 296,590 43,770    
Municipal securities [Member]        
Assets [Abstract]        
Trading securities 21,484 25,783    
Available for sale securities 624,500 508,365    
U.S. Treasury [Member]        
Assets [Abstract]        
Available for sale securities 898 1,000    
Residential non-agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 577,576 24,339    
Commercial agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 4,475,917 4,617,025    
Other debt securities [Member]        
Assets [Abstract]        
Trading securities 26,006 18,520    
Available for sale securities 473 472    
Fair Value, Recurring [Member]        
Assets [Abstract]        
Trading securities 4,464,161 9,136,813    
Available for sale securities 11,493,860 13,157,817    
Residential mortgage loans held for sale 75,272 [1] 192,295 [2]    
Mortgage servicing rights 277,608 [3] 163,198 [4]    
Derivative contracts, net of cash margin, Assets, Fair Value 880,343 [5] 1,097,297 [6]    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value 554,900 [5] 275,625 [6]    
Fair Value, Recurring [Member] | U.S. government securities [Member]        
Assets [Abstract]        
Trading securities 9,823 23,610    
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]        
Assets [Abstract]        
Trading securities 4,406,848 9,068,900    
Available for sale securities 5,814,496 8,006,616    
Fair value option securities 296,590 43,770    
Fair Value, Recurring [Member] | Municipal securities [Member]        
Assets [Abstract]        
Trading securities 21,484 25,783    
Available for sale securities 624,500 508,365    
Fair Value, Recurring [Member] | U.S. Treasury [Member]        
Assets [Abstract]        
Available for sale securities 898 1,000    
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 577,576 24,339    
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 4,475,917 4,617,025    
Fair Value, Recurring [Member] | Other debt securities [Member]        
Assets [Abstract]        
Available for sale securities 473 472    
Fair Value, Recurring [Member] | Other trading securities [Member]        
Assets [Abstract]        
Trading securities 26,006 18,520    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets [Abstract]        
Trading securities 4,970 4,999    
Available for sale securities 898 1,000    
Residential mortgage loans held for sale 0 [1] 0 [2]    
Mortgage servicing rights 0 [3] 0 [4]    
Derivative contracts, net of cash margin, Assets, Fair Value 2,110 [5] 8,331 [6]    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value 16 [5] 0 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]        
Assets [Abstract]        
Trading securities 4,970 4,999    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential agency mortgage-backed securities [Member]        
Assets [Abstract]        
Trading securities 0 0    
Available for sale securities 0 0    
Fair value option securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal securities [Member]        
Assets [Abstract]        
Trading securities 0 0    
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury [Member]        
Assets [Abstract]        
Available for sale securities 898 1,000    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities [Member]        
Assets [Abstract]        
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other trading securities [Member]        
Assets [Abstract]        
Trading securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets [Abstract]        
Trading securities 4,459,191 9,131,814    
Available for sale securities 11,492,489 13,156,345    
Residential mortgage loans held for sale 68,054 [1] 185,969 [2]    
Mortgage servicing rights 0 [3] 0 [4]    
Derivative contracts, net of cash margin, Assets, Fair Value 878,233 [5] 1,088,966 [6]    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value 554,884 [5] 275,625 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]        
Assets [Abstract]        
Trading securities 4,853 18,611    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]        
Assets [Abstract]        
Trading securities 4,406,848 9,068,900    
Available for sale securities 5,814,496 8,006,616    
Fair value option securities 296,590 43,770    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]        
Assets [Abstract]        
Trading securities 21,484 25,783    
Available for sale securities 624,500 508,365    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Treasury [Member]        
Assets [Abstract]        
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 577,576 24,339    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 4,475,917 4,617,025    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities [Member]        
Assets [Abstract]        
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading securities [Member]        
Assets [Abstract]        
Trading securities 26,006 18,520    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets [Abstract]        
Trading securities 0 0    
Available for sale securities 473 472    
Residential mortgage loans held for sale 7,218 [1] 6,326 [2]    
Mortgage servicing rights 277,608 [3] 163,198 [4]    
Derivative contracts, net of cash margin, Assets, Fair Value $ 0 [5] $ 0 [6]    
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies 77.55% 95.07%    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value $ 0 [5] $ 0 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. government securities [Member]        
Assets [Abstract]        
Trading securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential agency mortgage-backed securities [Member]        
Assets [Abstract]        
Trading securities 0 0    
Available for sale securities 0 0    
Fair value option securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal securities [Member]        
Assets [Abstract]        
Trading securities 0 0    
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Treasury [Member]        
Assets [Abstract]        
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities [Member]        
Assets [Abstract]        
Available for sale securities 473 472    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other trading securities [Member]        
Assets [Abstract]        
Trading securities $ 0 $ 0    
[1] Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 77.55% of the unpaid principal balance.
[2] Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 95.07% of the unpaid principal balance.
[3] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 7, Mortgage Banking Activities.
[4] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 7, Mortgage Banking Activities.
[5] See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset and liability positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts held for trading purposes.
[6] See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate derivative contracts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded energy derivative contracts, fully offset by cash margin.