v3.26.1
Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Assets: [Abstract]            
Trading securities $ 4,952,988   $ 5,392,745      
Available-for-sale securities 13,582,780   13,606,625      
Fair value option securities 28,461   102,096      
Mortgage servicing rights 333,998 $ 333,381 322,724 $ 334,644 $ 342,111 $ 338,145
Derviative contracts, net of cash collateral, Assets, Fair value 324,711   300,775      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 325,231   397,573      
U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 0   9,237      
Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 4,826,434   5,307,849      
Available-for-sale securities 10,129,404   9,598,627      
Fair value option securities 16,150   102,096      
Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 83,079   39,233      
Available-for-sale securities 112,845   184,273      
U.S. Treasury [Member]            
Assets: [Abstract]            
Available-for-sale securities 989   980      
Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 686,050   696,028      
Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 2,653,019   3,126,244      
Fair value option securities 12,311   0      
Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 43,475   36,426      
Available-for-sale securities 473   473      
Fair Value, Recurring [Member]            
Assets: [Abstract]            
Trading securities 4,952,988   5,392,745      
Available-for-sale securities 13,582,780   13,606,625      
Fair value option securities 28,461          
Residential mortgage loans held for sale 102,531 [1]   94,630 [2]      
Mortgage servicing rights 333,998 [3]   322,724 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value 324,711 [5]   300,775 [6]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 325,231 [5]   397,573 [6]      
Fair Value, Recurring [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities     9,237      
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 4,826,434   5,307,849      
Available-for-sale securities 10,129,404   9,598,627      
Fair value option securities 16,150   102,096      
Fair Value, Recurring [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 83,079   39,233      
Available-for-sale securities 112,845   184,273      
Fair Value, Recurring [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available-for-sale securities 989   980      
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 686,050   696,028      
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 2,653,019   3,126,244      
Fair value option securities 12,311          
Fair Value, Recurring [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 43,475   36,426      
Available-for-sale securities 473   473      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available-for-sale securities 989   980      
Fair value option securities 0          
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 1,740 [5]   1,022 [6]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 379 [5]   12 [6]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities     0      
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 989   980      
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 option securities 0          
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]            
Assets: [Abstract]            
Trading securities 4,952,988   5,392,745      
Available-for-sale securities 13,581,318   13,605,172      
Fair value option securities 28,461          
Residential mortgage loans held for sale 94,669 [1]   88,335 [2]      
Mortgage servicing rights 0 [3]   0 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value 322,971 [5]   299,753 [6]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 324,852 [5]   397,561 [6]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities     9,237      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 4,826,434   5,307,849      
Available-for-sale securities 10,129,404   9,598,627      
Fair value option securities 16,150   102,096      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 83,079   39,233      
Available-for-sale securities 112,845   184,273      
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 686,050   696,028      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 2,653,019   3,126,244      
Fair value option securities 12,311          
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 43,475   36,426      
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      
Fair value option securities 0          
Residential mortgage loans held for sale 7,862 [1]   6,295 [2]      
Mortgage servicing rights 333,998 [3]   322,724 [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 92.93%   82.84%      
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      
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 option securities 0          
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
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 92.93% 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 82.84% 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.