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Accounting Policies (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
unit
class
segment
Rate
Dec. 31, 2018
USD ($)
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  
Lease Commitments    
Minimum lease liability for capitalization $ 2,000  
Residual value guarantees or restriction or covenants imposed by leases no  
Minimum initial lease term for recording right of use asset and lease liability 12 months  
Other real estate    
Carrying value of other real estate $ 520,000 300,000
Repossessed assets    
Repossessed assets value $ 8,620,000 6,660,000
Goodwill and intangibles    
Number of reportable units used in goodwill allocation | unit 2  
Goodwill impairment $ 0  
Partnership investment    
Minimum percentage of partnership accounted for as equity investment | Rate 3.00%  
Investment in partnership $ 61,080,000.00 23,460,000
Segment reporting    
Number of business segments aggregated as reportable operating segments | segment 1  
Residential real estate portfolio    
Loans and leases    
Loans available for repurchase $ 1,440,000 $ 1,390,000
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  
Lease Commitments    
Economic life test to determine lease classification P20Y  
Fair value test percentage of the fair value of the asset | Rate 90.00%  
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