Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Derivative Instruments and Hedging Activities Interest Rate Sensitive Assets/Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]            
Available-for-sale securities, at fair value $ 6,664,744   $ 14,650,922      
Mortgage servicing rights, at fair value 2,213,312 $ 2,020,106 1,596,153 $ 1,257,503 $ 1,279,195 $ 1,909,444
Interest-Only-Strip [Member]            
Derivatives, Fair Value [Line Items]            
Available-for-sale securities, at fair value $ 365,200   $ 245,900