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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 289,727 $ 272,215
Available for sale securities, Unrealized Gains 11,158 6,455
Available for sale securities, Unrealized Losses 2,896 2,315
Debt Securities, Available-for-sale 297,989 $ 276,355 [1]
CALIFORNIA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 15,323  
Available for sale securities, Unrealized Gains 1,426  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 16,749  
NEW YORK    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,455  
Available for sale securities, Unrealized Gains 959  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 11,414  
TEXAS    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 9,887  
Available for sale securities, Unrealized Gains 844  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 10,731  
ILLINOIS    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 9,248  
Available for sale securities, Unrealized Gains 636  
Available for sale securities, Unrealized Losses 18  
Debt Securities, Available-for-sale 9,866  
FLORIDA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,497  
Available for sale securities, Unrealized Gains 669  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale $ 9,166  
[1] Derived from audited consolidated financial statements