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		12 Months Ended
		Dec. 31, 2018	Dec. 31, 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]	(4,432)	(11,830)
Additions		15,759	15,860
Sales		0	0
Ending Balance		95,596	84,269
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		7,342	(1,050)
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]	4,390	4,165
Additions		0	0
Sales		(4,103)	(4,266)
Ending Balance		1,187	900
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		$ 636	$ (1,569)

[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.