Federal Home Loan Bank (FHLB) Advances and Other Short-Term Borrowings (Details 1) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary of FHLB and Other Short Term Borrowings
Average balance during the year		$ 16,917	$ 13,550	$ 14,674
Average interest rate during the year		1.03%	0.54%	0.27%
Maximum month-end balance during the year		$ 32,000	$ 23,000	$ 23,500
Weighted average interest rate at year end		1.38%	0.59%	0.37%
Federal Home Loan Bank Advances
Summary of FHLB and Other Short Term Borrowings
Average balance during the year		$ 2,018	$ 2,249	$ 4,082
Average interest rate during the year	4.01%	0.33%	0.31%	0.10%
Maximum month-end balance during the year		$ 2,678	$ 3,608	$ 7,541
Weighted average interest rate at year end		0.34%	0.33%	0.11%