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Loans (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Loans Considered Current 98.90% 99.00%   98.80%
Loans and leases receivable, impaired, commitment to lend $ 0.0      
Residential real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Pledged assets separately reported, loans pledged as collateral, at fair value 524.1   $ 487.2  
Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Pledged assets separately reported, loans pledged as collateral, at fair value $ 198.9   $ 74.0