Derivatives and Hedging Activities - Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Amount of net fee income recognized in other non-interest income	$ 1.0	$ 0.8
Amount of net gains recognized in mortgage banking revenues	$ 4.5	$ 0.4