Regulatory Capital (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Regulatory Assets
Total stockholders' equity	$ 150,148		$ 109,957
Goodwill	(10,708)
Core deposit intangible (net of deferred tax liability)	(2,169)
AOCI Losses (Gains)	2,633	$ 2,182	1,191	$ 538	$ 489	$ 928
Common equity Tier 1 capital	139,904		111,148
TRUPs	12,000		12,000
Tier 1 capital	151,904		123,148
Allowable reserve for credit losses and other Tier 2 adjustments	10,790		10,545
Subordinated notes	23,000		23,000
Tier 2 capital	185,694		156,693
Risk-weighted assets ("RWA")	1,358,171		1,169,341
Average Assets ("AA")	$ 1,596,550		$ 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	10.30%		9.51%
Tier 1 capital to RWA	11.18%		10.53%
Tier 2 capital to RWA	13.67%		13.40%
Tier 1 capital to AA (leverage)	9.51%		8.79%
Common Stock [Member]
Regulatory Assets
Total stockholders' equity	$ 150,148		$ 109,957
Bank [Member]
Regulatory Assets
Goodwill	(10,708)
Core deposit intangible (net of deferred tax liability)	(2,169)
AOCI Losses (Gains)	2,633		1,191
Common equity Tier 1 capital	170,376		140,237
Tier 1 capital	170,376		140,237
Allowable reserve for credit losses and other Tier 2 adjustments	10,790		10,545
Tier 2 capital	181,166		150,782
Risk-weighted assets ("RWA")	1,354,942		1,164,478
Average Assets ("AA")	$ 1,593,387		$ 1,398,001
Common Tier 1 capital to RWA	12.57%		12.04%
Tier 1 capital to RWA	12.57%		12.04%
Tier 2 capital to RWA	13.37%		12.95%
Tier 1 capital to AA (leverage)	10.69%		10.03%
Bank [Member] | Common Stock [Member]
Regulatory Assets
Total stockholders' equity	$ 180,620		$ 139,046