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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 403,465 $ 398,643
Available for sale securities, Unrealized Gains 588 6,223
Available for sale securities, Unrealized Losses 36,004 3,763
Debt Securities, Available-for-sale 368,049 $ 401,103 [1]
CALIFORNIA    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 45,491  
Available for sale securities, Unrealized Gains 0  
Available for sale securities, Unrealized Losses 8,002  
Debt Securities, Available-for-sale 37,489  
TEXAS    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 23,573  
Available for sale securities, Unrealized Gains 37  
Available for sale securities, Unrealized Losses 3,635  
Debt Securities, Available-for-sale 19,975  
MICHIGAN    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 19,584  
Available for sale securities, Unrealized Gains 0  
Available for sale securities, Unrealized Losses 1,821  
Debt Securities, Available-for-sale 17,763  
WASHINGTON    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 14,399  
Available for sale securities, Unrealized Gains 67  
Available for sale securities, Unrealized Losses 1,300  
Debt Securities, Available-for-sale 13,166  
OREGON    
Marketable Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 14,746  
Available for sale securities, Unrealized Gains 0  
Available for sale securities, Unrealized Losses 3,070  
Debt Securities, Available-for-sale $ 11,676  
[1] Derived from audited consolidated financial statements