Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Mortgage Banking Revenue [Abstract]
Net realized gains on sale of mortgage loans	$ 6,883	$ 26,000
Net change in unrealized gain (loss) on mortgage loans held for sale	(5,827)	(6,955)
Net change in the fair value of mortgage loan commitments	(3,298)	(8,980)
Net change in the fair value of forward sales contracts	7,297	15,222
Total production revenue	5,055	25,287
Servicing revenue	11,595	11,826
Total mortgage banking revenue	$ 16,650	$ 37,113