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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 325,397 $ 267,105 $ 255,578
Available for sale securities, Unrealized Gains 5,101 3,005 7,206
Available for sale securities, Unrealized Losses 1,772 3,568 682
Available for sale securities, Estimated Fair Value 328,726 $ 266,542 [1] $ 262,102
Texas      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 20,215    
Available for sale securities, Unrealized Gains 440    
Available for sale securities, Unrealized Losses 71    
Available for sale securities, Estimated Fair Value 20,584    
MICHIGAN      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 18,823    
Available for sale securities, Unrealized Gains 235    
Available for sale securities, Unrealized Losses 212    
Available for sale securities, Estimated Fair Value 18,846    
CALIFORNIA      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 15,314    
Available for sale securities, Unrealized Gains 260    
Available for sale securities, Unrealized Losses 64    
Available for sale securities, Estimated Fair Value 15,510    
Illinois      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 12,463    
Available for sale securities, Unrealized Gains 244    
Available for sale securities, Unrealized Losses 38    
Available for sale securities, Estimated Fair Value 12,669    
PENNSYLVANIA      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 10,603    
Available for sale securities, Unrealized Gains 91    
Available for sale securities, Unrealized Losses 79    
Available for sale securities, Estimated Fair Value $ 10,615    
[1] Derived from audited consolidated financial statements