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Derivative Financial Instruments (Narrative) (Details)
1 Months Ended 3 Months Ended
Mar. 31, 2016
USD ($)
contract
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Derivative [Line Items]      
Deferred tax asset on gain on derivative   $ 352,000  
Decrease in fair value of derivatives   1,300,000  
Cash flow hedge ineffectiveness   0  
Interest Rate Swap Agreements [Member]      
Derivative [Line Items]      
Interest rate swap notional amount $ 30,000,000    
Number of interest rate swap contracts | contract 4    
Fair value of interest rate swap contracts   $ (1,400,000) $ (133,000)
Swap Contract 3 Year 5 Million [Member]      
Derivative [Line Items]      
Interest rate swap notional amount $ 5,000,000    
Derivative, maturity date Jun. 17, 2019    
Derivative, term of contract   3 years  
Swap Contract 5 Year $5 Million [Member]      
Derivative [Line Items]      
Interest rate swap notional amount $ 5,000,000    
Derivative, maturity date Mar. 17, 2021    
Derivative, term of contract   5 years  
Swap Contract- 7 year $5 Million [Member]      
Derivative [Line Items]      
Interest rate swap notional amount $ 5,000,000    
Derivative, maturity date Mar. 17, 2023    
Derivative, term of contract   7 years  
Swap Contract 10 Year $15 Million [Member]      
Derivative [Line Items]      
Interest rate swap notional amount $ 15,000,000    
Derivative, maturity date Mar. 17, 2026    
Derivative, term of contract   10 years