Acquisition and Discontinued Operations (Summary of Intangible Assets Recorded in Conjunction with MOB Transaction ) (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2020
Business Acquisition [Line Items]
Intangible assets, Fair Value		$ 102.6
Core Deposit Intangibles
Business Acquisition [Line Items]
Intangible assets, Fair Value		96.1
Customer Relationships
Business Acquisition [Line Items]
Intangible assets, Fair Value		3.5
Trade Name
Business Acquisition [Line Items]
Intangible assets, Fair Value		$ 3.0
MOB
Business Acquisition [Line Items]
Intangible assets, Fair Value	$ 102.6
MOB | Core Deposit Intangibles
Business Acquisition [Line Items]
Intangible assets, Fair Value	$ 96.1
Intangible assets, Estimated Useful Life	10 years
Intangible assets, Amortization Method	Straight line
MOB | Customer Relationships
Business Acquisition [Line Items]
Intangible assets, Fair Value	$ 3.5
Intangible assets, Estimated Useful Life	10 years
Intangible assets, Amortization Method	Accelerated
MOB | Trade Name
Business Acquisition [Line Items]
Intangible assets, Fair Value	$ 3.0
Intangible assets, Estimated Useful Life	10 years
Intangible assets, Amortization Method	Straight line