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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 338,929 $ 277,157
Available for sale securities, Unrealized Gains 8,604 10,715
Available for sale securities, Unrealized Losses 1,791 1,745
Debt Securities, Available-for-sale 345,742 $ 286,127 [1]
CALIFORNIA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 24,918  
Available for sale securities, Unrealized Gains 932  
Available for sale securities, Unrealized Losses 182  
Debt Securities, Available-for-sale 25,668  
TEXAS    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 14,546  
Available for sale securities, Unrealized Gains 756  
Available for sale securities, Unrealized Losses 42  
Debt Securities, Available-for-sale 15,260  
FLORIDA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 12,775  
Available for sale securities, Unrealized Gains 493  
Available for sale securities, Unrealized Losses 31  
Debt Securities, Available-for-sale 13,237  
WASHINGTON    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 11,186  
Available for sale securities, Unrealized Gains 280  
Available for sale securities, Unrealized Losses 115  
Debt Securities, Available-for-sale 11,351  
VIRGINIA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,799  
Available for sale securities, Unrealized Gains 408  
Available for sale securities, Unrealized Losses 1  
Debt Securities, Available-for-sale $ 11,206  
[1] Derived from audited consolidated financial statements