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Significant Accounting Policies - Schedule of Loan Servicing Rights Recognized (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Beginning balance, mortgage servicing rights $ 483,492 $ 424,470
Mortgage servicing rights recognized 207,827 182,443
Mortgage servicing rights sold (122) 0
Amortization expense (134,266) (123,008)
Other 0 (413)
Ending balance, mortgage servicing rights $ 556,931 $ 483,492