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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 265,778 $ 294,251
Available for sale securities, Unrealized Gains 6,152 1,907
Available for sale securities, Unrealized Losses 2,010 3,011
Debt Securities, Available-for-sale 269,920 $ 293,147 [1]
CALIFORNIA    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 16,108  
Available for sale securities, Unrealized Gains 1,126  
Available for sale securities, Unrealized Losses 2  
Debt Securities, Available-for-sale 17,232  
ILLINOIS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 15,518  
Available for sale securities, Unrealized Gains 512  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 16,030  
MICHIGAN    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,940  
Available for sale securities, Unrealized Gains 481  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 11,421  
WEST VIRGINIA    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 9,399  
Available for sale securities, Unrealized Gains 219  
Available for sale securities, Unrealized Losses 13  
Debt Securities, Available-for-sale 9,605  
NEW YORK    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,561  
Available for sale securities, Unrealized Gains 348  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale $ 8,909  
[1] Derived from audited consolidated financial statements