Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ 6,612	$ 234	$ 7,843	$ 795
Mortgage Banking Derivatives [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	6,704	(48)	7,744	614
Interest Rate Swap [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	10	296	82	147
Foreign Exchange Contract [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ (102)	$ (14)	$ 17	$ 34