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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 334,090 $ 267,105 $ 253,671
Available for sale securities, Unrealized Gains 4,935 3,005 8,838
Available for sale securities, Unrealized Losses 2,214 3,568 876
Available for sale securities, Estimated Fair Value 336,811 $ 266,542 [1] $ 261,633
Texas      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 20,932    
Available for sale securities, Unrealized Gains 352    
Available for sale securities, Unrealized Losses 97    
Available for sale securities, Estimated Fair Value 21,187    
CALIFORNIA      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 19,306    
Available for sale securities, Unrealized Gains 229    
Available for sale securities, Unrealized Losses 150    
Available for sale securities, Estimated Fair Value 19,385    
MICHIGAN      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 17,117    
Available for sale securities, Unrealized Gains 127    
Available for sale securities, Unrealized Losses 237    
Available for sale securities, Estimated Fair Value 17,007    
Illinois      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 13,351    
Available for sale securities, Unrealized Gains 340    
Available for sale securities, Unrealized Losses 95    
Available for sale securities, Estimated Fair Value 13,596    
PENNSYLVANIA      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 10,616    
Available for sale securities, Unrealized Gains 40    
Available for sale securities, Unrealized Losses 125    
Available for sale securities, Estimated Fair Value $ 10,531    
[1] Derived from audited consolidated financial statements