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Federal Home Loan Bank Advances and Other Borrowings - Activities in other borrowings (Details) - Other Borrowings - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Average balance outstanding $ 50,866 $ 48,732
Maximum amount outstanding at any month-end during the year 52,996 53,586
Balance outstanding at end of year $ 46,139 $ 49,971
Weighted average interest rate during the year 1.86% 1.94%