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Preferred Stock (Narrative) (Details) - $ / shares
 9 Months Ended
Sep. 30, 2018
Nov. 05, 2018
Dec. 31, 2017
Class of Stock [Line Items]      
Series D Preferred Stock, Shares Outstanding 3,404   0
Redeemable Preferred Stock [Member] | Subsequent Event [Member]      
Class of Stock [Line Items]      
Series D Preferred Stock, Shares Outstanding   3,404  
Preferred Stock [Member]      
Class of Stock [Line Items]      
Number of rights to receive cumulative preferred stock upon conversion of fixed rate cumulative perpetual preferred stock 1    
Preferred stock, liquidation preference per share $ 1,000    
Stock issued during period, shares, new issues 3,404    
Preferred Stock, Dividend Payment Terms Dividends are payable quarterly on February 15, May 15, August 15 and November 15 of each year. The dividend rate on the Mid Penn Preferred Stock is fixed at 9%.    
Preferred Stock Dividend Rate Percentage 9.00%