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Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Assets: [Abstract]        
Trading securities $ 5,851,752 $ 4,899,090    
Available-for-sale securities 13,102,877 12,851,600    
Fair value option securities 17,550 17,876    
Mortgage servicing rights 342,111 338,145 $ 319,330 $ 293,884
Derviative contracts, net of cash collateral, Assets, Fair value 405,202 242,809    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 180,001 237,582    
U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 1,497 21,275    
Residential agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Trading securities 5,713,746 4,792,695    
Available-for-sale securities 8,839,322 8,639,389    
Fair value option securities 17,550 17,876    
Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 88,189 62,230    
Available-for-sale securities 222,282 225,568    
U.S. Treasury [Member]        
Assets: [Abstract]        
Available-for-sale securities 957 945    
Residential non-agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available-for-sale securities 760,144 781,209    
Commercial agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available-for-sale securities 3,279,699 3,204,016    
Other debt securities [Member]        
Assets: [Abstract]        
Trading securities 48,320 22,890    
Available-for-sale securities 473 473    
Fair Value, Recurring [Member]        
Assets: [Abstract]        
Trading securities 5,851,752 4,899,090    
Available-for-sale securities 13,102,877 12,851,600    
Residential mortgage loans held for sale 79,664 [1] 77,561 [2]    
Mortgage servicing rights 342,111 [3] 338,145 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value 405,202 [5] 242,809 [6]    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 180,001 [5] 237,582 [6]    
Fair Value, Recurring [Member] | U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 1,497 21,275    
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Trading securities 5,713,746 4,792,695    
Available-for-sale securities 8,839,322 8,639,389    
Fair value option securities 17,550 17,876    
Fair Value, Recurring [Member] | Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 88,189 62,230    
Available-for-sale securities 222,282 225,568    
Fair Value, Recurring [Member] | Other trading securities        
Assets: [Abstract]        
Trading securities 48,320 22,890    
Fair Value, Recurring [Member] | U.S. Treasury [Member]        
Assets: [Abstract]        
Available-for-sale securities 957 945    
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available-for-sale securities 760,144 781,209    
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available-for-sale securities 3,279,699 3,204,016    
Fair Value, Recurring [Member] | Other debt securities [Member]        
Assets: [Abstract]        
Available-for-sale securities 473 473    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets: [Abstract]        
Trading securities 0 1,494    
Available-for-sale securities 957 945    
Residential mortgage loans held for sale 0 [1] 0 [2]    
Mortgage servicing rights 0 [3] 0 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value 2,600 [5] 656 [6]    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 1,428 [5] 3,391 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 0 1,494    
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] | Other trading securities        
Assets: [Abstract]        
Trading securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury [Member]        
Assets: [Abstract]        
Available-for-sale securities 957 945    
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 2 [Member]        
Assets: [Abstract]        
Trading securities 5,851,752 4,897,596    
Available-for-sale securities 13,101,447 12,850,182    
Residential mortgage loans held for sale 73,198 [1] 70,564 [2]    
Mortgage servicing rights 0 [3] 0 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value 402,602 [5] 242,153 [6]    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 178,573 [5] 234,191 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 1,497 19,781    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Trading securities 5,713,746 4,792,695    
Available-for-sale securities 8,839,322 8,639,389    
Fair value option securities 17,550 17,876    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 88,189 62,230    
Available-for-sale securities 222,282 225,568    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading securities        
Assets: [Abstract]        
Trading securities 48,320 22,890    
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 760,144 781,209    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available-for-sale securities 3,279,699 3,204,016    
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 3 [Member]        
Assets: [Abstract]        
Trading securities 0 0    
Available-for-sale securities 473 473    
Residential mortgage loans held for sale 6,466 [1] 6,997 [2]    
Mortgage servicing rights 342,111 [3] 338,145 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 0 [5] $ 0 [6]    
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies 80.46% 81.11%    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, 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] | Other trading securities        
Assets: [Abstract]        
Trading 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 $ 473    
[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 80.46% 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 81.11% 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 5, 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 5, 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 and internal risk management purposes.
[6] 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 and internal risk management purposes.