Other Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Management fees	$ 369	$ 1,187	$ 1,151
Amortization of intangibles	2,671	49	8
Merger related costs	6,794	984	0
Business and franchise tax	1,803	953	875
Data processing	2,779	947	1,029
FDIC insurance	1,485	789	634
Investor fees	613	759	570
Advertising and promotional expense	790	735	754
Consulting fees	1,202	681	618
Accounting and auditing service	956	613	612
Telephone	703	385	346
Director fees	703	352	395
Stock option expense	442	335	332
Business development, meals, and travel	337	293	260
Regulatory examinations	418	282	257
Credit report	375	281	197
Publication and subscription	268	280	249
Early payoff	132	260	133
Insurance	434	255	206
Disaster recovery	292	199	190
Stationary and supplies	405	197	294
Employee education and development	85	186	198
FRB and Bank analysis charges	260	163	147
Verification fees	164	150	106
SBA guarantee fee	137	145	160
Postage	105	97	93
Dues and memberships	152	95	108
Common stock expense	73	95	97
Legal fees	400	79	363
Donations	44	64	73
Courier	149	57	59
Impairment of goodwill	1,491	0	0
Other	3,244	1,021	1,346
Other noninterest expense	$ 30,275	$ 12,968	$ 11,860