Annual report pursuant to Section 13 and 15(d)

Fair Value, Measurement Inputs, Disclosure (Details)

v3.19.1
Fair Value, Measurement Inputs, Disclosure (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Available-for-sale, Categorized as Level 2 Assets 99.60%      
Debt Securities, Available-for-sale, Categorized as Level 3 Assets 0.40%      
Assets Reported at Fair Value, Debt Securities, Available-for-sale 91.70%      
Mortgage Servicing Rights Categorized as Level 3 Assets 100.00%      
Interest Rate Swaps, Swaptions and Credit Default Swaps Categorized as Level 2 Assets (Liabilities) 100.00%      
Short U.S. Treasury and Inverse Interest-only Securities Categorized as Level 2 Assets 100.00%      
Agency To-be-Announced Securities Categorized as Level 1 Assets (Liabilities) 100.00%      
Mortgage servicing rights $ 1,993,440 $ 1,086,717 $ 693,815 $ 493,688
Derivative assets, at fair value 319,981 309,918    
Derivative liabilities, at fair value 820,590 31,903    
Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 25,552,604 21,220,819    
Mortgage servicing rights 1,993,440 1,086,717    
Derivative assets, at fair value 319,981 309,918    
Other assets   29,413    
Total assets 27,866,025 22,646,867    
Derivative liabilities, at fair value 820,590 31,903    
Total liabilities 820,590 31,903    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0 0    
Mortgage servicing rights 0 0    
Derivative assets, at fair value 21,602 913    
Other assets   29,413    
Total assets 21,602 30,326    
Derivative liabilities, at fair value 0 1,930    
Total liabilities 0 1,930    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 25,447,447 21,067,678    
Mortgage servicing rights 0 0    
Derivative assets, at fair value 298,379 309,005    
Other assets   0    
Total assets 25,745,826 21,376,683    
Derivative liabilities, at fair value 820,590 29,973    
Total liabilities 820,590 29,973    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 105,157 153,141    
Mortgage servicing rights 1,993,440 1,086,717    
Derivative assets, at fair value 0 0    
Other assets   0    
Total assets 2,098,597 1,239,858    
Derivative liabilities, at fair value 0 0    
Total liabilities $ 0 $ 0