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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 394,879 $ 398,643
Available for sale securities, Unrealized Gains 1,344 6,223
Available for sale securities, Unrealized Losses 21,368 3,763
Debt Securities, Available-for-sale 374,855 $ 401,103 [1]
CALIFORNIA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 47,963  
Available for sale securities, Unrealized Gains 71  
Available for sale securities, Unrealized Losses 4,832  
Debt Securities, Available-for-sale 43,202  
TEXAS    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 23,385  
Available for sale securities, Unrealized Gains 66  
Available for sale securities, Unrealized Losses 2,324  
Debt Securities, Available-for-sale 21,127  
PENNSYLVANIA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 14,101  
Available for sale securities, Unrealized Gains 123  
Available for sale securities, Unrealized Losses 848  
Debt Securities, Available-for-sale 13,376  
OREGON    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 14,751  
Available for sale securities, Unrealized Gains 0  
Available for sale securities, Unrealized Losses 1,928  
Debt Securities, Available-for-sale 12,823  
WASHINGTON    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 12,737  
Available for sale securities, Unrealized Gains 60  
Available for sale securities, Unrealized Losses 851  
Debt Securities, Available-for-sale $ 11,946  
[1] Derived from audited consolidated financial statements