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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost $ 297,463 $ 324,908
Available for sale securities, Unrealized Gains 2,584 5,329
Available for sale securities, Unrealized Losses 3,157 1,514
Available for sale securities, Estimated Fair Value 296,890 $ 328,723 [1]
Texas    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 18,779  
Available for sale securities, Unrealized Gains 283  
Available for sale securities, Unrealized Losses 87  
Available for sale securities, Estimated Fair Value 18,975  
MICHIGAN    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 14,716  
Available for sale securities, Unrealized Gains 95  
Available for sale securities, Unrealized Losses 227  
Available for sale securities, Estimated Fair Value 14,584  
CALIFORNIA    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 14,290  
Available for sale securities, Unrealized Gains 173  
Available for sale securities, Unrealized Losses 90  
Available for sale securities, Estimated Fair Value 14,373  
NEW YORK [Domain]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 11,319  
Available for sale securities, Unrealized Gains 123  
Available for sale securities, Unrealized Losses 126  
Available for sale securities, Estimated Fair Value 11,316  
WEST VIRGINIA    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 10,806  
Available for sale securities, Unrealized Gains 83  
Available for sale securities, Unrealized Losses 42  
Available for sale securities, Estimated Fair Value $ 10,847  
[1] Derived from audited consolidated financial statements