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Basis of Presentation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 05, 2019
Dec. 31, 2018
Common stock par value per share $ 1.00   $ 1.00
Right-of-use asset $ 3,792    
Accounting Standards Update 2016-02 [Member]      
Operating lease liabilities     $ 4,400
Right-of-use asset     $ 4,000
Accounting Standards Update 2018-02 [Member]      
Reclassification amount from accumulated other comprehensive income related to Tax Cuts and jobs Act $ 471    
DNB [Member]      
Common stock par value per share   $ 1.00  
S&T Bank [Member]      
Business acquisition share price   1.22  
Common stock par value per share   $ 2.50