Loan Sales and Servicing - Residential MSRs (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance				$ 42,022
Increase (decrease) in fair value:
Ending balance		$ 28,731		28,731
Residential Mortgage
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		29,035	$ 41,966	42,022	$ 51,539
Additions		3,244	1,600	7,654	4,305
Increase (decrease) in fair value:
Due to changes in valuation inputs or assumptions		(1,052)	(4,269)	(13,866)	(11,303)
Due to other changes in fair value	[1]	(2,496)	(2,032)	(7,079)	(7,276)
Ending balance		$ 28,731	$ 37,265	$ 28,731	$ 37,265

[1] Represents the realization of expected net servicing cash flows, expected borrower repayments and the passage of time.