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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 266,123 $ 276,443 $ 275,204
Available for sale securities, Unrealized Gains 6,803 5,576 7,732
Available for sale securities, Unrealized Losses 1,411 1,227 801
Available for sale securities, Estimated Fair Value 271,515 $ 280,792 [1] $ 282,135
Illinois      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 10,803    
Available for sale securities, Unrealized Gains 441    
Available for sale securities, Unrealized Losses 10    
Available for sale securities, Estimated Fair Value 11,234    
MICHIGAN      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 9,473    
Available for sale securities, Unrealized Gains 202    
Available for sale securities, Unrealized Losses 4    
Available for sale securities, Estimated Fair Value 9,671    
West Virginia      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 7,676    
Available for sale securities, Unrealized Gains 133    
Available for sale securities, Unrealized Losses 0    
Available for sale securities, Estimated Fair Value 7,809    
Texas      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 7,173    
Available for sale securities, Unrealized Gains 406    
Available for sale securities, Unrealized Losses 0    
Available for sale securities, Estimated Fair Value 7,579    
WASHINGTON      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 5,429    
Available for sale securities, Unrealized Gains 202    
Available for sale securities, Unrealized Losses 0    
Available for sale securities, Estimated Fair Value $ 5,631    
[1] December 31, 2015 financial information has been extracted from audited consolidated financial statements