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Nature of Operations and Critical Accounting Policies (Narrative) (Details)
 3 Months Ended
May 01, 2020
USD ($)
item
Mar. 31, 2020
USD ($)
employee
Dec. 31, 2019
USD ($)
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Year founded   1903  
Capitalized contract cost     $ 0
Assets   $ 1,062,495,000 1,009,927,000
Total deposits   $ 919,661,000 $ 835,737,000
Goodwill term   15 years  
Executives [Member]      
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Number of individuals with split dollar life insurance arrangement | employee   4  
Subsequent Event [Member]      
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Number of businesses combined in acquisition | item 2    
Assets $ 1,600,000,000    
Total deposits 1,400,000,000    
Loans $ 1,100,000,000    
Number of offices | item 21