Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Reportable segments | segment			3
Revenues:
Interest income	$ 27,692	$ 12,778	$ 68,385	$ 37,095
Gain on sales of loans	5,594	8,316	14,985	19,419
Other revenues	2,929	369	8,426	5,258
Total revenues	36,215	21,463	91,796	61,772
Expenses:
Interest expense	3,098	1,635	7,926	4,641
Salaries and employee benefits	11,100	8,208	31,800	24,283
Other expenses	12,593	4,711	32,614	12,188
Total operating expenses	26,791	14,554	72,340	41,112
Income before income taxes	9,424	6,909	19,456	20,660
Total assets	2,873,069	1,362,838	2,873,069	1,362,838	$ 1,430,708
Operating Segments | Commercial Banking
Revenues:
Interest income	27,429	12,531	67,740	36,379
Gain on sales of loans	0	0	0	0
Other revenues	1,977	682	4,445	2,908
Total revenues	29,406	13,213	72,185	39,287
Expenses:
Interest expense	3,072	1,640	7,796	4,656
Salaries and employee benefits	7,334	3,977	19,992	12,065
Other expenses	8,724	2,578	20,173	6,285
Total operating expenses	19,130	8,195	47,961	23,006
Income before income taxes	10,276	5,018	24,224	16,281
Total assets	2,810,037	1,290,518	2,810,037	1,290,518
Operating Segments | Trust & Wealth Management
Revenues:
Interest income	4	0	7	0
Gain on sales of loans	0	0	0	0
Other revenues	1,617	773	4,195	2,269
Total revenues	1,621	773	4,202	2,269
Expenses:
Interest expense	0	0	0	0
Salaries and employee benefits	868	567	2,686	1,655
Other expenses	1,850	233	2,541	783
Total operating expenses	2,718	800	5,227	2,438
Income before income taxes	(1,097)	(27)	(1,025)	(169)
Total assets	41,002	2,894	41,002	2,894
Operating Segments | Mortgage Banking
Revenues:
Interest income	299	574	846	1,355
Gain on sales of loans	5,594	8,316	14,985	19,419
Other revenues	(740)	(1,060)	(306)	53
Total revenues	5,153	7,830	15,525	20,827
Expenses:
Interest expense	(25)	261	18	439
Salaries and employee benefits	2,898	3,664	9,122	10,563
Other expenses	1,149	1,491	3,246	4,127
Total operating expenses	4,022	5,416	12,386	15,129
Income before income taxes	1,131	2,414	3,139	5,698
Total assets	26,485	74,195	26,485	74,195
Other
Revenues:
Interest income	5	5	17	15
Gain on sales of loans	0	0	0	0
Other revenues	312	289	975	978
Total revenues	317	294	992	993
Expenses:
Interest expense	96	66	337	200
Salaries and employee benefits	0	0	0	0
Other expenses	1,107	724	7,537	1,943
Total operating expenses	1,203	790	7,874	2,143
Income before income taxes	(886)	(496)	(6,882)	(1,150)
Total assets	19,756	18,420	19,756	18,420
Eliminations
Revenues:
Interest income	(45)	(332)	(225)	(654)
Gain on sales of loans	0	0	0	0
Other revenues	(237)	(315)	(883)	(950)
Total revenues	(282)	(647)	(1,108)	(1,604)
Expenses:
Interest expense	(45)	(332)	(225)	(654)
Salaries and employee benefits	0	0	0	0
Other expenses	(237)	(315)	(883)	(950)
Total operating expenses	(282)	(647)	(1,108)	(1,604)
Income before income taxes	0	0	0	0
Total assets	$ (24,211)	$ (23,189)	$ (24,211)	$ (23,189)