Derivatives (Net Gains (Losses) on Derivatives Designated as Hedges) (Details) - Fair Value Hedging - Derivative instruments designated as hedging instruments - Interest Expense - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Certificates of deposits
Derivative [Line Items]
Recognized on certificates of deposit	$ (37)	$ 520	$ (2,732)	$ 2,239
Interest rate contracts
Derivative [Line Items]
Recognized on interest rate swaps	$ 202	$ (241)	$ 3,056	$ (2,089)