Other Income and Other Operating Expenses - Schedule of Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Merger related expenses	$ 1,012	$ 0	$ 6,747	$ 0
Data processing	77	263	1,226	669
Amortization	839	13	1,642	37
Business and franchise tax	515	238	985	717
FDIC insurance	387	168	1,248	475
Consulting fees	314	284	870	584
Advertising and promotional	211	142	548	541
Accounting and auditing	255	154	694	460
Investor fees	162	212	463	541
Telephone	256	94	519	281
Regulatory examinations	100	69	282	207
Stock option	107	83	310	251
Director fees	192	93	496	279
Credit report	106	77	292	199
Legal fees	158	47	285	117
Insurance	99	82	322	188
Publication and subscription	118	61	281	218
Disaster recovery	93	46	204	151
Office supplies-stationary print	136	52	288	149
FRB and bank analysis charges	87	43	179	123
Dues and memberships	38	20	109	67
Management fees	137	448	295	935
Verification fees	38	46	119	118
Travel	39	28	156	125
SBA guarantee fee	36	35	104	112
Early payoff	71	4	121	215
Business development and meals	21	23	79	83
Automotive	17	15	50	41
Appraisal fee	9	11	33	30
Courier	31	13	79	42
Common stock	6	40	57	81
Education and training	26	24	57	151
Bank paid closing costs	8	4	55	23
Postage	6	22	95	69
Goodwill impairment	1,491	0	1,491	0
Other	1,476	239	2,813	761
Other operating expenses	8,674	3,193	23,594	9,040
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Amortization	$ 839	$ 13	$ 1,642	$ 37