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		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
MSR [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 84,269	$ 80,239
Total net (loss) gain included in Mortgage banking, net	[1]	5,423	(5,108)
Additions		7,719	7,497
Sales		0	0
Ending Balance		97,411	82,628
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		11,264	175
Other Assets - Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		900	1,001
Total net (loss) gain included in Mortgage banking, net	[1]	2,698	2,577
Additions		0	0
Sales		(2,146)	(2,580)
Ending Balance		1,452	998
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		$ 327	$ (572)

[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.