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Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mortgage Banking Revenue [Abstract]      
Net realized gains on sales of mortgage loans $ 107,847 $ 39,730 $ 36,379
Net change in unrealized gain on mortgage loans held for sale 6,697 672 (674)
Net change in fair value of mortgage loan commitments 15,202 (145) (1,145)
Net change in the fair value of forward sales contracts (3,898) 2,463 (2,870)
Total mortgage production revenue 125,848 42,720 31,690
Servicing revenue 56,512 64,821 66,097
Total mortgage banking revenue $ 182,360 $ 107,541 $ 97,787