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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 259,136 $ 294,251
Available for sale securities, Unrealized Gains 7,807 1,907
Available for sale securities, Unrealized Losses 1,596 3,011
Debt Securities, Available-for-sale 265,347 $ 293,147 [1]
CALIFORNIA    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 17,649  
Available for sale securities, Unrealized Gains 1,573  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 19,222  
ILLINOIS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 13,180  
Available for sale securities, Unrealized Gains 613  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 13,793  
MICHIGAN    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,902  
Available for sale securities, Unrealized Gains 655  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 11,557  
NEW YORK    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,546  
Available for sale securities, Unrealized Gains 476  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 9,022  
WEST VIRGINIA    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,406  
Available for sale securities, Unrealized Gains 228  
Available for sale securities, Unrealized Losses 3  
Debt Securities, Available-for-sale $ 8,631  
[1] Derived from audited consolidated financial statements