Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ 1,231	$ 561
Mortgage Banking Derivatives [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	1,040	662
Interest Rate Swap [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	72	(149)
Foreign Exchange Contract [Member]
Derivative [Line Items]
Net fair value gains on derivative financial instruments	$ 119	$ 48