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Securities - Securities Sold (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]      
Carrying Value $ 2,403 $ 495,192  
Net Proceeds 2,387 495,340 $ 4,028
Gain/(Loss) (16) 148 1,186
Carrying Value     2,842
Net Proceeds     4,028
Gain/(Loss)     1,186
Obligations of other U.S. Government agencies and corporations      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value   11,088  
Net Proceeds   10,974  
Gain/(Loss)   (114)  
Obligations of states and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value   110,019  
Net Proceeds   112,199  
Gain/(Loss)   2,180  
Trust preferred securities      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value   9,346  
Net Proceeds   9,403  
Gain/(Loss)   57  
Other debt securities      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value   7,269  
Net Proceeds   7,395  
Gain/(Loss)   126  
Other equity securities      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value     2,842
Net Proceeds     4,028
Gain/(Loss)     $ 1,186
Obligations of states and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value 901    
Net Proceeds 893    
Gain/(Loss) (8)    
Government agency mortgage backed securities | Residential mortgage backed securities      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value 943 264,924  
Net Proceeds 942 263,217  
Gain/(Loss) (1) (1,707)  
Government agency mortgage backed securities | Commercial mortgage backed securities      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value   14,104  
Net Proceeds   14,082  
Gain/(Loss)   (22)  
Government agency collateralized mortgage obligations | Residential mortgage backed securities      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value 559 72,153  
Net Proceeds 552 71,781  
Gain/(Loss) $ (7) (372)  
Government agency collateralized mortgage obligations | Commercial mortgage backed securities      
Debt Securities, Available-for-sale [Line Items]      
Carrying Value   6,289  
Net Proceeds   6,289  
Gain/(Loss)   $ 0