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Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets [Abstract]        
Trading securities $ 4,707,975 $ 1,623,921    
Available for sale securities 13,050,665 11,269,643    
Fair value option securities 114,982 1,098,577    
Mortgage servicing rights 101,172 201,886 $ 259,254 $ 252,867
Derivative contracts, net of cash margin, Assets, Fair Value 810,688 323,375    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value 405,779 251,128    
U.S. government securities [Member]        
Assets [Abstract]        
Trading securities 9,183 44,264    
Residential agency mortgage-backed securities [Member]        
Assets [Abstract]        
Trading securities 4,669,148 1,504,651    
Available for sale securities 9,340,471 8,046,096    
Fair value option securities 114,982 1,088,660    
Municipal securities [Member]        
Assets [Abstract]        
Trading securities 19,172 26,196    
Available for sale securities 167,979 1,861    
Asset-backed securities [Member]        
Assets [Abstract]        
Trading securities 0 14,084    
U.S. Treasury [Member]        
Assets [Abstract]        
Available for sale securities 508 1,600    
Fair value option securities 0 9,917    
Residential non-agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 32,770 41,609    
Commercial agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 3,508,465 3,178,005    
Other debt securities [Member]        
Assets [Abstract]        
Trading securities 10,472 34,726    
Available for sale securities 472 472    
Fair Value, Recurring [Member]        
Assets [Abstract]        
Trading securities 4,707,975 1,623,921    
Available for sale securities 13,050,665 11,269,643    
Fair value option securities 114,982 1,098,577    
Residential mortgage loans held for sale 252,316 [1] 182,271 [2]    
Mortgage servicing rights 101,172 [3] 201,886 [4]    
Derivative contracts, net of cash margin, Assets, Fair Value 810,688 [5] 323,375 [6]    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value 405,779 [5] 251,128 [6]    
Fair Value, Recurring [Member] | U.S. government securities [Member]        
Assets [Abstract]        
Trading securities 9,183 44,264    
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]        
Assets [Abstract]        
Trading securities 4,669,148 1,504,651    
Available for sale securities 9,340,471 8,046,096    
Fair value option securities   1,088,660    
Fair Value, Recurring [Member] | Municipal securities [Member]        
Assets [Abstract]        
Trading securities 19,172 26,196    
Available for sale securities 167,979 1,861    
Fair Value, Recurring [Member] | Asset-backed securities [Member]        
Assets [Abstract]        
Trading securities   14,084    
Fair Value, Recurring [Member] | U.S. Treasury [Member]        
Assets [Abstract]        
Available for sale securities 508 1,600    
Fair value option securities   9,917    
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 32,770 41,609    
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 3,508,465 3,178,005    
Fair Value, Recurring [Member] | Other debt securities [Member]        
Assets [Abstract]        
Trading securities 10,472 34,726    
Available for sale securities 472 472    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets [Abstract]        
Trading securities 4,999 0    
Available for sale securities 508 1,600    
Fair value option securities 0 9,917    
Residential mortgage loans held for sale 0 [1] 0 [2]    
Mortgage servicing rights 0 [3] 0 [4]    
Derivative contracts, net of cash margin, Assets, Fair Value 10,780 [5] 8,944 [6]    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value 0 [5] 0 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]        
Assets [Abstract]        
Trading securities 4,999 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    
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] | Asset-backed securities [Member]        
Assets [Abstract]        
Trading securities   0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury [Member]        
Assets [Abstract]        
Available for sale securities 508 1,600    
Fair value option securities   9,917    
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]        
Trading securities 0 0    
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets [Abstract]        
Trading securities 4,702,976 1,623,921    
Available for sale securities 13,049,685 11,267,571    
Fair value option securities 114,982 1,088,660    
Residential mortgage loans held for sale 245,299 [1] 173,958 [2]    
Mortgage servicing rights 0 [3] 0 [4]    
Derivative contracts, net of cash margin, Assets, Fair Value 799,908 [5] 314,431 [6]    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value 405,779 [5] 251,128 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]        
Assets [Abstract]        
Trading securities 4,184 44,264    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]        
Assets [Abstract]        
Trading securities 4,669,148 1,504,651    
Available for sale securities 9,340,471 8,046,096    
Fair value option securities   1,088,660    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]        
Assets [Abstract]        
Trading securities 19,172 26,196    
Available for sale securities 167,979 1,861    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities [Member]        
Assets [Abstract]        
Trading securities   14,084    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Treasury [Member]        
Assets [Abstract]        
Available for sale securities 0 0    
Fair value option securities   0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 32,770 41,609    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]        
Assets [Abstract]        
Available for sale securities 3,508,465 3,178,005    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities [Member]        
Assets [Abstract]        
Trading securities 10,472 34,726    
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 472 472    
Fair value option securities 0 0    
Residential mortgage loans held for sale 7,017 [1] 8,313 [2]    
Mortgage servicing rights 101,172 [3] 201,886 [4]    
Derivative contracts, net of cash margin, Assets, Fair Value 0 [5] 0 [6]    
Liabilities [Abstract]        
Derivative contracts, net of cash margin, Liabilities, Fair Value $ 0 [5] $ 0 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential mortgage loans held for sale [Member]        
Liabilities [Abstract]        
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies 94.57% 95.23%    
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    
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] | Asset-backed securities [Member]        
Assets [Abstract]        
Trading 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 option securities   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]        
Trading securities 0 0    
Available for sale securities $ 472 $ 472    
[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 94.57% 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 95.23% 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 7, 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 7, Mortgage Banking Activities.
[5] See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded interest rate, energy and agricultural derivative contracts, fully offset by cash margin.
[6] See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate and energy derivative contracts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate and agricultural contracts, fully offset by cash margin.