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Accounting Policies (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
unit
class
segment
Dec. 31, 2015
USD ($)
Securities    
Held-to-maturity investment securities $ 0 $ 0
Loans and leases    
Percentage of the principal balance that may be repurchased of a delinquent Ginnie Mae (GNMA) mortgage loan (as a percent) 100.00%  
Reserve for loan and lease losses    
Number of classes within loan and lease portfolio | class 8  
Other real estate    
Carrying value of other real estate $ 700,000 740,000
Repossessed assets    
Repossessed assets value $ 9,370,000 6,930,000
Goodwill and intangibles    
Number of reportable units used in goodwill allocation | unit 2  
Partnership investment    
Minimum percentage of partnership accounted for as equity investment 3.00%  
Investment in partnership $ 12,170,000 11,990,000
Segment reporting    
Number of business segments aggregated as reportable operating segments | segment 1  
Residential real estate portfolio    
Loans and leases    
Loans available for repurchase $ 3,270,000 $ 5,270,000
Minimum    
Loans and leases    
Period of sustained performance required to change from non-performing to performing status 6 months  
Amount necessary for impairment evaluation $ 100,000  
Reserve for loan and lease losses    
Threshold value of loan or lease for evaluation of the appropriateness of the impairment reserve $ 100,000  
Equipment owned under operating lease    
Lease term 3 years  
Premises and equipment    
Useful life of premises and equipment 3 years  
Income taxes    
Tax benefit realized on settlement, percentage 50.00%  
Minimum | Federal funds purchased    
Short-term borrowings:    
Term of short-term debt 1 day  
Minimum | Security repurchase agreements    
Short-term borrowings:    
Term of short-term debt 1 day  
Minimum | Other short-term borrowings    
Short-term borrowings:    
Term of short-term debt 1 day  
Minimum | Commercial paper    
Short-term borrowings:    
Term of short-term debt 7 days  
Maximum    
Equipment owned under operating lease    
Lease term 7 years  
Premises and equipment    
Useful life of premises and equipment 31 years 6 months  
Goodwill and intangibles    
Useful life of finite lived assets 25 years  
Maximum | Federal funds purchased    
Short-term borrowings:    
Term of short-term debt 365 days  
Maximum | Security repurchase agreements    
Short-term borrowings:    
Term of short-term debt 365 days  
Maximum | Other short-term borrowings    
Short-term borrowings:    
Term of short-term debt 365 days  
Maximum | Commercial paper    
Short-term borrowings:    
Term of short-term debt 270 days