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, 2017	Jun. 30, 2016
MSR [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 80,239	$ 74,007
Total net (loss) gain included in Mortgage banking, net	[1]	(5,108)	(18,404)
Additions		7,497	7,211
Sales		0	0
Ending Balance		82,628	62,814
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		175	(13,899)
Other Assets - Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		1,001	1,113
Total net (loss) gain included in Mortgage banking, net	[1]	2,577	7,340
Additions		0	0
Sales		(2,580)	(3,781)
Ending Balance		998	4,672
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		$ (572)	$ 1,157

[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.