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Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Assets: [Abstract]            
Trading securities $ 2,859,444   $ 9,136,813      
Available for sale securities 10,152,663   13,157,817      
Fair value option securities 37,927   43,770      
Mortgage servicing rights 270,312 $ 209,563 163,198 $ 117,629 $ 132,915 $ 101,172
Derviative contracts, net of cash collateral, Assets, Fair value 1,992,977   1,097,297      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 214,576   275,625      
U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 8,357   23,610      
Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 2,807,950   9,068,900      
Available for sale securities 4,913,245   8,006,616      
Fair value option securities 37,927   43,770      
Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 18,825   25,783      
Available for sale securities 638,305   508,365      
U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 927   1,000      
Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 519,613   24,339      
Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 4,080,101   4,617,025      
Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 24,312   18,520      
Available for sale securities 472   472      
Fair Value, Recurring [Member]            
Assets: [Abstract]            
Trading securities 2,859,444   9,136,813      
Available for sale securities 10,152,663   13,157,817      
Residential mortgage loans held for sale 182,726 [1]   192,295 [2]      
Mortgage servicing rights 270,312 [3]   163,198 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value 1,992,977   1,097,297      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 214,576   275,625      
Fair Value, Recurring [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 8,357   23,610      
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 2,807,950   9,068,900      
Available for sale securities 4,913,245   8,006,616      
Fair value option securities 37,927   43,770      
Fair Value, Recurring [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 18,825   25,783      
Available for sale securities 638,305   508,365      
Fair Value, Recurring [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 927   1,000      
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 519,613   24,339      
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 4,080,101   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 24,312   18,520      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]            
Assets: [Abstract]            
Trading securities 8,357   4,999      
Available for sale securities 927   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 8,357   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 927   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 2,851,087   9,131,814      
Available for sale securities 10,151,264   13,156,345      
Residential mortgage loans held for sale 174,600 [1]   185,969 [2]      
Mortgage servicing rights 0 [3]   0 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value 1,992,977   1,088,966      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 214,576   275,625      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 0   18,611      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 2,807,950   9,068,900      
Available for sale securities 4,913,245   8,006,616      
Fair value option securities 37,927   43,770      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 18,825   25,783      
Available for sale securities 638,305   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 519,613   24,339      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 4,080,101   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 24,312   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 8,126 [1]   6,326 [2]      
Mortgage servicing rights 270,312 [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 86.67%   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 86.67% 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.