Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Mortgage Banking Revenue [Abstract]
Net realized gains on sales of mortgage loans	$ 76,282	$ 107,847	$ 39,730
Net change in unrealized gain on mortgage loans held for sale	(5,818)	6,697	672
Net change in fair value of mortgage loan commitments	(14,268)	15,202	(145)
Net change in the fair value of forward sales contracts	4,516	(3,898)	2,463
Total mortgage production revenue	60,712	125,848	42,720
Servicing revenue	45,184	56,512	64,821
Total mortgage banking revenue	$ 105,896	$ 182,360	$ 107,541