Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Interest Rate Sensitive Assets/Liabilities (Details)

v3.21.1
Derivative Instruments and Hedging Activities Interest Rate Sensitive Assets/Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]        
Available-for-sale securities, at fair value $ 11,473,390 $ 14,650,922    
Mortgage servicing rights, at fair value 2,091,761 1,596,153 $ 1,505,163 $ 1,909,444
Interest-Only-Strip [Member]        
Derivatives, Fair Value [Line Items]        
Available-for-sale securities, at fair value $ 425,300 $ 245,900