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Long-Term Borrowings and Subordinated Debt - Interest Expense and Weighted Average Interest Rates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]      
Long-term borrowings $ 47,301 $ 14,713 $ 117,043
Weighted average interest rate 1.88% 2.91% 0.81%
Interest expense $ 463 $ 670 $ 790