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Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Assets: [Abstract]            
Trading securities $ 5,139,725   $ 5,193,505      
Available-for-sale securities 13,015,986   12,286,681      
Fair value option securities 19,172   20,671      
Mortgage servicing rights 315,920 $ 333,246 293,884 $ 311,382 $ 304,722 $ 277,608
Derviative contracts, net of cash collateral, Assets, Fair value 334,382   410,304      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 402,559   587,473      
U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 332,466   10,959      
Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 4,672,427   5,105,137      
Available-for-sale securities 8,577,928   6,834,720      
Fair value option securities 19,172   20,671      
Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 76,004   37,413      
Available-for-sale securities 228,171   502,833      
U.S. Treasury [Member]            
Assets: [Abstract]            
Available-for-sale securities 951   925      
Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 838,783   799,877      
Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 3,369,680   4,147,853      
Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 58,828   39,996      
Available-for-sale securities 473   473      
Fair Value, Recurring [Member]            
Assets: [Abstract]            
Trading securities 5,139,725   5,193,505      
Available-for-sale securities 13,015,986   12,286,681      
Residential mortgage loans held for sale 95,494 [1]   56,935 [2]      
Mortgage servicing rights 315,920 [3]   293,884 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value 334,382 [5]   410,304 [6]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 402,559 [5]   587,473 [6]      
Fair Value, Recurring [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 332,466   10,959      
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 4,672,427   5,105,137      
Available-for-sale securities 8,577,928   6,834,720      
Fair value option securities 19,172   20,671      
Fair Value, Recurring [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 76,004   37,413      
Available-for-sale securities 228,171   502,833      
Fair Value, Recurring [Member] | Other trading securities            
Assets: [Abstract]            
Trading securities 58,828   39,996      
Fair Value, Recurring [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available-for-sale securities 951   925      
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 838,783   799,877      
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 3,369,680   4,147,853      
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 308,370   9,017      
Available-for-sale securities 951   925      
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 1,426 [5]   0 [6]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 0 [5]   2,607 [6]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 308,370   9,017      
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 951   925      
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 4,831,355   5,184,488      
Available-for-sale securities 13,014,562   12,285,283      
Residential mortgage loans held for sale 88,161 [1]   49,749 [2]      
Mortgage servicing rights 0 [3]   0 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value 332,956 [5]   410,304 [6]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 402,559 [5]   584,866 [6]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 24,096   1,942      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 4,672,427   5,105,137      
Available-for-sale securities 8,577,928   6,834,720      
Fair value option securities 19,172   20,671      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 76,004   37,413      
Available-for-sale securities 228,171   502,833      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading securities            
Assets: [Abstract]            
Trading securities 58,828   39,996      
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 838,783   799,877      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 3,369,680   4,147,853      
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 7,333 [1]   7,186 [2]      
Mortgage servicing rights 315,920 [3]   293,884 [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 82.54%   77.74%      
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      
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 82.54% 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 77.74% 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 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 purposes.