Loans and Allowance for Loan Losses (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Loans and Allowance for Loan Losses (Textual)
Part of loans of 30 days or more past due as a percentage of total loan portfolio	0.34%	0.55%
Loans over 90 days past due and still accruing
Real estate loan percentage of total loan	82.10%	81.10%
Consumer loans percentage of total real estate loan	40.20%
Mortgage loan pledged as collateral for advances from FHLB	$ 487,000
Foregone interest income on non accrual loans	$ 309	$ 439
Loans which exceed supervision loan to value limits, description	Approximately $97.7 million, or 7.0% of our loans had loan-to-value ratios which exceeded regulatory supervisory limits.
Loan with loan to value ratio of greater than 100%, description	Which 76 loans totaling approximately $40.5 million had loan-to-value ratios of 100% or more.
Commercial loans percentage of total loan portfolio	59.80%
Net of deferred loan fees and costs	$ 2,300	$ 2,000
Owner occupied RE [Member]
Loans and Allowance for Loan Losses (Textual)
Commercial loans percentage of total loan portfolio	22.80%
Non-owner occupied RE [Member]
Loans and Allowance for Loan Losses (Textual)
Commercial loans percentage of total loan portfolio	22.60%
Construction [Member]
Loans and Allowance for Loan Losses (Textual)
Commercial loans percentage of total loan portfolio	3.70%
Commercial [Member]
Loans and Allowance for Loan Losses (Textual)
Part of loans of 30 days or more past due as a percentage of total loan portfolio	0.12%	0.38%
Consumer [Member]
Loans and Allowance for Loan Losses (Textual)
Part of loans of 30 days or more past due as a percentage of total loan portfolio	0.23%	0.17%