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Borrowings (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Borrowings [Abstract]    
Federal Funds Purchased $ 2,000 $ 0
Securities Sold under Agreements to Repurchase 21,885 18,704
Federal Home Loan Bank advances 35,000 0
Short-term Debt 58,885 18,704
Long-term Debt and Capital Lease Obligations, Current, Total 10,000 0
Maximum month-end outstanding balance 76,319 68,864
Average outstanding balance during the period $ 49,131 $ 39,364
Average interest rate (year-to-date) 0.66% 0.59%
Average interest rate at end of period 0.86% 0.10%
Available federal funds lines $ 55,000 $ 55,000
Available credit with FHLB $ 238,990 $ 270,048