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Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mortgage Banking Revenue [Abstract]        
Net realized gains on sale of mortgage loans $ 9,063 $ 12,041 $ 28,699 $ 32,443
Net change in unrealized gain on mortgage loans held for sale (2,135) (1,492) (2,457) 3,335
Net change in the fair value of mortgage loan commitments (2,446) (1,927) (1,496) (667)
Net change in the fair value of forward sales contracts 2,768 (293) 1,871 (4,399)
Total production revenue 7,250 8,329 26,617 30,712
Servicing revenue 16,286 16,561 49,290 49,645
Total mortgage banking revenue $ 23,536 $ 24,890 $ 75,907 $ 80,357