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Loans (Not Covered by Share Agreements (Percentage)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Loans delinquent 30-89 days as a percentage of total loans 0.27% 0.37%
Loans secured by real estate property in process of foreclosure $ 3.1  
Threshold period past due, nonperforming status of loans and leases 90 days  
Nonpass    
Financing Receivable, Recorded Investment [Line Items]    
Percent of nonaccrual loans 16.00% 17.00%
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Percent of loans 52.00% 47.00%
Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Percent of loans 48.00% 53.00%