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Goodwill and Other Intangible Assets - Schedule of Amortizing Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 33,634 $ 33,428  
Accumulated Amortization 26,006 24,165  
Net Carrying Amount 7,628 9,263  
Amortization of intangible assets 1,771 1,932 $ 2,090
Core deposit intangible      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 18,774 18,774  
Accumulated Amortization 15,386 14,302  
Net Carrying Amount 3,388 4,472  
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 8,877 8,878  
Accumulated Amortization 5,888 5,339  
Net Carrying Amount 2,989 3,539  
Other intangibles      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 5,983 5,776  
Accumulated Amortization 4,732 4,524  
Net Carrying Amount $ 1,251 $ 1,252