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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost $ 284,419 $ 324,908
Available for sale securities, Unrealized Gains 2,257 5,329
Available for sale securities, Unrealized Losses 3,455 1,514
Available for sale securities, Estimated Fair Value 283,221 $ 328,723 [1]
Texas    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 19,978  
Available for sale securities, Unrealized Gains 226  
Available for sale securities, Unrealized Losses 97  
Available for sale securities, Estimated Fair Value 20,107  
MICHIGAN    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 15,800  
Available for sale securities, Unrealized Gains 108  
Available for sale securities, Unrealized Losses 216  
Available for sale securities, Estimated Fair Value 15,692  
CALIFORNIA    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 20,384  
Available for sale securities, Unrealized Gains 215  
Available for sale securities, Unrealized Losses 154  
Available for sale securities, Estimated Fair Value 20,445  
NEW YORK    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 13,605  
Available for sale securities, Unrealized Gains 127  
Available for sale securities, Unrealized Losses 176  
Available for sale securities, Estimated Fair Value 13,556  
WEST VIRGINIA    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 12,119  
Available for sale securities, Unrealized Gains 92  
Available for sale securities, Unrealized Losses 97  
Available for sale securities, Estimated Fair Value $ 12,114  
[1] Derived from audited consolidated financial statements