Regulatory Capital (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Regulatory Assets
Total stockholders' equity	$ 147,246		$ 109,957
Goodwill	(10,603)
Core deposit intangible (net of deferred tax liability)	(2,309)
AOCI Losses (Gains)	2,182	$ 1,898	1,191	$ 489	$ 801	$ 928
Common equity Tier 1 capital	136,516		111,148
TRUPs	12,000		12,000
Tier 1 capital	148,516		123,148
Allowable reserve for credit losses and other Tier 2 adjustments	10,776		10,545
Subordinated notes	23,000		23,000
Tier 2 capital	182,292		156,693
Risk-weighted assets ("RWA")	1,322,840		1,169,341
Average Assets ("AA")	$ 1,569,489		$ 1,401,741
Common Tier 1 capital to RWA, 2019 Regulatory Min. Ratio + CCB	7.00%
Tier 1 capital to RWA, 2019 Regulatory Min. Ratio + CCB	8.50%
Tier 2 capital to RWA, 2019 Regulatory Min. Ratio + CCB	10.50%
Common Tier 1 capital to RWA	10.32%		9.51%
Tier 1 capital to RWA	11.23%		10.53%
Tier 2 capital to RWA	13.78%		13.40%
Tier 1 capital to AA (leverage)	9.46%		8.79%
Common Stock [Member]
Regulatory Assets
Total stockholders' equity	$ 147,246		$ 109,957
Bank [Member]
Regulatory Assets
Goodwill	(10,603)
Core deposit intangible (net of deferred tax liability)	(2,309)
AOCI Losses (Gains)	2,182		1,191
Common equity Tier 1 capital	167,637		140,237
Tier 1 capital	167,637		140,237
Allowable reserve for credit losses and other Tier 2 adjustments	10,776		10,545
Tier 2 capital	178,413		150,782
Risk-weighted assets ("RWA")	1,319,955		1,164,478
Average Assets ("AA")	$ 1,566,336		$ 1,398,001
Common Tier 1 capital to RWA	12.70%		12.04%
Tier 1 capital to RWA	12.70%		12.04%
Tier 2 capital to RWA	13.52%		12.95%
Tier 1 capital to AA (leverage)	10.70%		10.03%
Bank [Member] | Common Stock [Member]
Regulatory Assets
Total stockholders' equity	$ 178,367		$ 139,046