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Long-Term Borrowings and Subordinated Debt - Scheduled Annual Maturities and Average Interest Rates (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]      
2018 Balance $ 2,496    
2019 Balance 37,514    
2020 Balance 2,004    
2021 Balance 1,057    
2022 Balance 529    
Thereafter Balance 3,701    
Total Long-term Balance $ 47,301 $ 14,713 $ 117,043
2018 Average Rate 3.60%    
2019 Average Rate 1.60%    
2020 Average Rate 3.22%    
2021 Average Rate 3.44%    
2022 Average Rate 4.50%    
Thereafter Average Rate 1.96%    
Total Average Rate 1.88%