Derivatives and Hedging Activities (Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives Not Designated as a Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 16,920	$ 14,405
Liability Derivatives	17,959	14,766
Derivatives Not Designated as a Hedging Instruments [Member] | Other Assets [Member] | Interest rate products [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	16,619	14,154
Derivatives Not Designated as a Hedging Instruments [Member] | Other Assets [Member] | Credit contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	301	251
Derivatives Not Designated as a Hedging Instruments [Member] | Other Liabilities [Member] | Interest rate products [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	17,959	14,766
Derivatives Not Designated as a Hedging Instruments [Member] | Other Liabilities [Member] | Credit contracts [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	798	1,229
Liability Derivatives	0	0
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest rate products [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	798	1,229
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest rate products [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0	$ 0