Short Term and Long Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Short-Term Borrowings [Abstract]
Available fed funds lines	$ 45,000	$ 55,000
Available credit with FHLB	217,000	270,000
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Federal funds purchased	10,000	0
Overnight repurchase agreements	20,693	18,704
Federal Home Loan Bank advances	47,500	0
Total short-term borrowings	78,193	18,704
Maximum month-end outstanding balance	79,819	68,864
Average outstanding balance during the period	$ 53,165	$ 39,364
Average interest rate during the period	0.72%	0.59%
Average interest rate at end of period	1.27%	0.10%
Federal Home Loan Bank, Advances [Line Items]
Advance Amount	$ 20,000
Long-term borrowings		$ 0
Maximum [Member]
Federal Home Loan Bank, Advances [Line Items]
Overnight repurchase agreements maturity period	4 days
Minimum [Member]
Federal Home Loan Bank, Advances [Line Items]
Overnight repurchase agreements maturity period	1 day
1.54% Fixed Rate Hybrid [Member]
Federal Home Loan Bank, Advances [Line Items]
Interest Rate	1.54%
Maturity Date	Feb. 28, 2019
Advance Amount	$ 10,000
1.90% Fixed Rate Hybrid [Member]
Federal Home Loan Bank, Advances [Line Items]
Interest Rate	1.90%
Maturity Date	Nov. 15, 2019
Advance Amount	$ 10,000