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Borrowings - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long-term borrowings    
2019 $ 7,000  
2020 82,529  
2022 7,500  
2023 7,500  
Thereafter 15,000  
Long-term debt 119,529 $ 122,029
Fixed Rate    
Long-term borrowings    
2019 7,000  
2020 7,500  
2022 7,500  
2023 7,500  
Thereafter 15,000  
Long-term debt 44,500  
Floating Rate    
Long-term borrowings    
2020 75,029  
Long-term debt $ 75,029