Fair Value - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Recurring Basis [Member] - Level 3 [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
MSR [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 66,464	$ 79,394
Total net (loss) gain included in Mortgage banking, net	[1]	8,593	(26,606)
Additions		7,978	3,649
Sales		0	0
Ending Balance		83,035	56,437
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held, end of period		13,696	(23,999)
Other Assets - Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		9,560	1,439
Total net (loss) gain included in Mortgage banking, net	[1]	2,748	9,606
Additions		0	0
Sales		(8,203)	(1,219)
Ending Balance		4,105	9,826
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held, end of period		$ 1,579	$ 4,428

[1] Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off.