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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 305,989 $ 277,157
Available for sale securities, Unrealized Gains 7,667 10,715
Available for sale securities, Unrealized Losses 2,272 1,745
Debt Securities, Available-for-sale 311,384 $ 286,127 [1]
CALIFORNIA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 22,374  
Available for sale securities, Unrealized Gains 658  
Available for sale securities, Unrealized Losses 444  
Debt Securities, Available-for-sale 22,588  
TEXAS    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,949  
Available for sale securities, Unrealized Gains 575  
Available for sale securities, Unrealized Losses 117  
Debt Securities, Available-for-sale 11,407  
NEW YORK    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,425  
Available for sale securities, Unrealized Gains 759  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 11,184  
VIRGINIA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,801  
Available for sale securities, Unrealized Gains 226  
Available for sale securities, Unrealized Losses 31  
Debt Securities, Available-for-sale 10,996  
FLORIDA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 7,717  
Available for sale securities, Unrealized Gains 385  
Available for sale securities, Unrealized Losses 66  
Debt Securities, Available-for-sale $ 8,036  
[1] Derived from audited consolidated financial statements