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Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Mar. 31, 2020  
Debt Securities, Available-for-sale, Amortized Cost $ 301,720 $ 272,215
Available for sale securities, Unrealized Gains 7,845 6,455
Available for sale securities, Unrealized Losses 4,520 2,315
Debt Securities, Available-for-sale 305,045 $ 276,355 [1]
CALIFORNIA    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 18,077  
Available for sale securities, Unrealized Gains 875  
Available for sale securities, Unrealized Losses 25  
Debt Securities, Available-for-sale 18,927  
TEXAS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 12,696  
Available for sale securities, Unrealized Gains 547  
Available for sale securities, Unrealized Losses 36  
Debt Securities, Available-for-sale 13,207  
MICHIGAN    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,826  
Available for sale securities, Unrealized Gains 635  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 11,461  
NEW YORK    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,485  
Available for sale securities, Unrealized Gains 487  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 10,972  
ILLINOIS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 9,246  
Available for sale securities, Unrealized Gains 441  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale $ 9,687  
[1] Derived from audited consolidated financial statements