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Federal Home Loan Bank Advances and Other Borrowings - Activities in advances from the FHLB (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Activities in advances from the FHLB    
Average balance outstanding $ 290,839 $ 58,814
Maximum amount outstanding at any month-end during the year 490,148 278,000
Balance outstanding at end of year $ 490,148 $ 278,000
Weighted average interest rate during the year 1.19% 0.59%