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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 06, 2017
Dec. 31, 2018
Accounting Policies [Line Items]    
FDIC indemnification asset termination, cash paid $ 10.1  
FDIC indemnification asset, termination benefit $ 1.4  
Minimum [Member] | Accounting Standards Update 201602 [Member]    
Accounting Policies [Line Items]    
Effect of adoption of new accounting pronouncements   $ 20.0
Maximum [Member] | Accounting Standards Update 201602 [Member]    
Accounting Policies [Line Items]    
Effect of adoption of new accounting pronouncements   $ 25.0