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Employee Benefits (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
employee
Mar. 31, 2019
USD ($)
employee
Dec. 31, 2019
USD ($)
Mar. 20, 2019
employee
Dec. 31, 2017
employee
Mar. 29, 2017
employee
Defined Benefit Plan Disclosure [Line Items]            
Purchase of life insurance policies   $ 2,000        
Cash surrender value of bank owned life insurance $ 23,426   $ 23,261      
Earnings on bank-owned life insurance 165 $ 146 146      
Number of officers with split dollar life insurance arrangement | employee   1     11  
Split dollar life insurance arrangement, death benefit 23,400          
Split dollar life insurance arrangement, death benefit to be paid to insured's beneficiary 4,100          
Split dollar life insurance arrangement, death benefit to be paid to Company $ 19,300          
Number of officers with opportunity to retain benefit equal to two times highest base salary after separation | employee 4          
Split dollar life insurance arrangement, accrued expense $ 119   107      
Supplemental Executive Retirement Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Number of officers who entered into supplemental executive retirement agreement | employee       1   5
Defined contribution plan, accrued expense $ 1,600   $ 1,400