Loans and Allowance for Loan Losses (Details 2) - Commercial loans [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	$ 1,084,049	$ 906,953
Owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	372,120	316,818
Non-owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	399,166	312,798
Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	68,415	51,179
Business [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	244,348	226,158
Pass [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	1,069,728	886,501
Pass [Member] | Owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	368,266	312,628
Pass [Member] | Non-owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	394,880	306,965
Pass [Member] | Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	68,415	51,179
Pass [Member] | Business [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	238,167	215,729
Special mention [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	3,879	9,392
Special mention [Member] | Owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	725	1,770
Special mention [Member] | Non-owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	121	2,082
Special mention [Member] | Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans
Special mention [Member] | Business [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	3,033	5,540
Substandard [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	10,442	11,060
Substandard [Member] | Owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	3,129	2,420
Substandard [Member] | Non-owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	4,165	3,751
Substandard [Member] | Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans
Substandard [Member] | Business [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans	3,148	4,889
Doubtful [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans
Doubtful [Member] | Owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans
Doubtful [Member] | Non-owner occupied RE [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans
Doubtful [Member] | Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans
Doubtful [Member] | Business [Member]
Outstanding commercial and consumer loans by risk category
Outstanding commercial loans