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Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Assets: [Abstract]        
Trading securities $ 4,891,096 $ 9,136,813    
Available for sale securities 12,894,534 13,157,817    
Fair value option securities 185,003 43,770    
Mortgage servicing rights 209,563 163,198 $ 132,915 $ 101,172
Derviative contracts, net of cash collateral, Assets, Fair value 2,680,207 1,097,297    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 557,834 275,625    
U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 13,513 23,610    
Residential agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Trading securities 4,827,504 9,068,900    
Available for sale securities 7,612,021 8,006,616    
Fair value option securities 185,003 43,770    
Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 24,539 25,783    
Available for sale securities 526,322 508,365    
U.S. Treasury [Member]        
Assets: [Abstract]        
Available for sale securities 947 1,000    
Residential non-agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 347,187 24,339    
Commercial agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 4,407,585 4,617,025    
Other debt securities [Member]        
Assets: [Abstract]        
Trading securities 25,540 18,520    
Available for sale securities 472 472    
Fair Value, Recurring [Member]        
Assets: [Abstract]        
Trading securities 4,891,096 9,136,813    
Available for sale securities 12,894,534 13,157,817    
Residential mortgage loans held for sale 169,474 [1] 192,295 [2]    
Mortgage servicing rights 209,563 [3] 163,198 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value 2,680,207 1,097,297    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 557,834 275,625    
Fair Value, Recurring [Member] | U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 13,513 23,610    
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Trading securities 4,827,504 9,068,900    
Available for sale securities 7,612,021 8,006,616    
Fair value option securities 185,003 43,770    
Fair Value, Recurring [Member] | Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 24,539 25,783    
Available for sale securities 526,322 508,365    
Fair Value, Recurring [Member] | U.S. Treasury [Member]        
Assets: [Abstract]        
Available for sale securities 947 1,000    
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 347,187 24,339    
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 4,407,585 4,617,025    
Fair Value, Recurring [Member] | Other debt securities [Member]        
Assets: [Abstract]        
Available for sale securities 472 472    
Fair Value, Recurring [Member] | Other trading securities        
Assets: [Abstract]        
Trading securities 25,540 18,520    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets: [Abstract]        
Trading securities 4,978 4,999    
Available for sale securities 947 1,000    
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 0 8,331    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 4,978 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 947 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        
Assets: [Abstract]        
Trading securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets: [Abstract]        
Trading securities 4,886,118 9,131,814    
Available for sale securities 12,893,115 13,156,345    
Residential mortgage loans held for sale 160,507 [1] 185,969 [2]    
Mortgage servicing rights 0 [3] 0 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value 2,680,207 1,088,966    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 557,834 275,625    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 8,535 18,611    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Trading securities 4,827,504 9,068,900    
Available for sale securities 7,612,021 8,006,616    
Fair value option securities 185,003 43,770    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 24,539 25,783    
Available for sale securities 526,322 508,365    
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 347,187 24,339    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 4,407,585 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        
Assets: [Abstract]        
Trading securities 25,540 18,520    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets: [Abstract]        
Trading securities 0 0    
Available for sale securities 472 472    
Residential mortgage loans held for sale 8,967 [1] 6,326 [2]    
Mortgage servicing rights 209,563 [3] 163,198 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 0 $ 0    
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies 95.07% 95.07%    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value $ 0 $ 0    
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] | 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 472 472    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other trading securities        
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 95.07% 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 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.