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Securities - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
security
institution
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Securities sold, at carrying value $ 2,403,000   $ 2,403,000    
Sale proceeds 2,387,000   2,387,000 $ 43,494,000  
Realized gain (loss) on AFS debt securities (16,000) $ 57,000 (16,000) 57,000  
Fair Value 1,177,606,000   $ 1,177,606,000   $ 671,488,000
Number of institutions issuing debt | institution     160    
Trust preferred securities          
Debt Securities, Available-for-sale [Line Items]          
Fair Value 10,304,000   $ 10,304,000   9,388,000
Number of securities representing interests in tranches of trusts (tranches) | security     2    
Impairments     $ 0    
Secure government, public and trust deposits          
Debt Securities, Available-for-sale [Line Items]          
Available for sale securities pledged as collateral 576,135,000   576,135,000   217,867,000
Short-term borrowings          
Debt Securities, Available-for-sale [Line Items]          
Available for sale securities pledged as collateral 18,349,000   18,349,000   25,888,000
Trust preferred securities          
Debt Securities, Available-for-sale [Line Items]          
Securities sold, at carrying value   9,346,000   9,346,000  
Sale proceeds   9,403,000      
Realized gain (loss) on AFS debt securities   57,000      
Fair Value $ 10,304,000   $ 10,304,000   $ 9,388,000
Residential mortgage backed securities          
Debt Securities, Available-for-sale [Line Items]          
Securities sold, at carrying value   2,946,000   2,946,000  
Sale proceeds       2,946,000  
Mortgage backed securities          
Debt Securities, Available-for-sale [Line Items]          
Securities sold, at carrying value   14,750,000   14,750,000  
Collateralized mortgage obligations          
Debt Securities, Available-for-sale [Line Items]          
Securities sold, at carrying value   16,395,000   16,395,000  
Obligations of states and political subdivisions          
Debt Securities, Available-for-sale [Line Items]          
Securities sold, at carrying value   $ 4,876,000   $ 4,876,000