Derivatives and Hedging Activities (Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivatives Not Designated as a Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 74,764	$ 107,749
Liability derivatives	75,740	109,148
Derivatives Not Designated as a Hedging Instruments | Other Assets | Interest rate products
Derivatives, Fair Value [Line Items]
Asset derivatives	74,668	107,652
Derivatives Not Designated as a Hedging Instruments | Other Assets | Credit contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	96	97
Derivatives Not Designated as a Hedging Instruments | Other Liabilities | Interest rate products
Derivatives, Fair Value [Line Items]
Liability derivatives	75,740	109,148
Derivatives Not Designated as a Hedging Instruments | Other Liabilities | Credit contracts
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	1,778	(6,671)
Liability derivatives	2,488	0
Designated as Hedging Instrument | Other Assets | Interest rate products
Derivatives, Fair Value [Line Items]
Asset derivatives	1,778	(6,671)
Designated as Hedging Instrument | Other Liabilities | Interest rate products
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 2,488	$ 0