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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 282,289 $ 267,105 $ 266,123
Available for sale securities, Unrealized Gains 3,070 3,005 6,803
Available for sale securities, Unrealized Losses 3,331 3,568 1,411
Available for sale securities, Estimated Fair Value 282,028 $ 266,542 [1] $ 271,515
MICHIGAN      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 15,807    
Available for sale securities, Unrealized Gains 33    
Available for sale securities, Unrealized Losses 492    
Available for sale securities, Estimated Fair Value 15,348    
Illinois      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 10,073    
Available for sale securities, Unrealized Gains 231    
Available for sale securities, Unrealized Losses 97    
Available for sale securities, Estimated Fair Value 10,207    
West Virginia      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 8,352    
Available for sale securities, Unrealized Gains 27    
Available for sale securities, Unrealized Losses 52    
Available for sale securities, Estimated Fair Value 8,327    
Texas      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 11,981    
Available for sale securities, Unrealized Gains 73    
Available for sale securities, Unrealized Losses 169    
Available for sale securities, Estimated Fair Value 11,885    
CALIFORNIA      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 11,741    
Available for sale securities, Unrealized Gains 111    
Available for sale securities, Unrealized Losses 251    
Available for sale securities, Estimated Fair Value $ 11,601    
[1] December 31, 2016 financial information has been extracted from audited consolidated financial statements