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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 255,578 $ 276,443 $ 266,839
Available for sale securities, Unrealized Gains 7,206 5,576 6,258
Available for sale securities, Unrealized Losses 682 1,227 970
Available for sale securities, Estimated Fair Value 262,102 $ 280,792 [1] $ 272,127
MICHIGAN      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 14,237    
Available for sale securities, Unrealized Gains 462    
Available for sale securities, Unrealized Losses 31    
Available for sale securities, Estimated Fair Value 14,668    
Illinois      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 10,167    
Available for sale securities, Unrealized Gains 587    
Available for sale securities, Unrealized Losses 2    
Available for sale securities, Estimated Fair Value 10,752    
West Virginia      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 8,725    
Available for sale securities, Unrealized Gains 157    
Available for sale securities, Unrealized Losses 7    
Available for sale securities, Estimated Fair Value 8,875    
Texas      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 8,197    
Available for sale securities, Unrealized Gains 371    
Available for sale securities, Unrealized Losses 20    
Available for sale securities, Estimated Fair Value 8,548    
INDIANA      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 5,852    
Available for sale securities, Unrealized Gains 252    
Available for sale securities, Unrealized Losses 39    
Available for sale securities, Estimated Fair Value $ 6,065    
[1] December 31, 2015 financial information has been extracted from audited consolidated financial statements