Derivatives and Hedging Activities Non-Designated Hedges (Details) - Not Designated as Hedging Instrument	Mar. 31, 2020 USD ($) derivativeContract	Dec. 31, 2019 USD ($) derivativeContract
Interest rate swaps
Derivative [Line Items]
Notional amount	$ 1,700,000,000	$ 1,600,000,000
Foreign exchange contracts
Derivative [Line Items]
Notional amount	0	0
Risk participation agreements
Derivative [Line Items]
Notional amount	$ 58,400,000	$ 58,800,000
Number of contracts | derivativeContract	7	7
Other Contract
Derivative [Line Items]
Notional amount	$ 30,400,000	$ 20,500,000
Number of contracts | derivativeContract	5	4