Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 4,453,527	$ 3,107,617	$ 4,453,527	$ 3,107,617	$ 4,230,528
Interest income	40,030	26,112	78,426	51,846
Interest expense	4,730	2,451	8,843	4,662
Net interest income	35,300	23,661	69,583	47,184
Provision for loan and lease losses	2,766	830	5,211	1,156
Noninterest income	16,009	14,001	30,979	27,832
Intangible expenses	446	991	1,205	1,757
Acquisition-related and integration costs and restructuring charges		1,185		1,405
Other noninterest expense	32,102	27,370	63,373	53,323
Intersegment (revenue) expense	0	0	0	0
Income before income taxes	15,995	7,286	30,773	17,375
Income taxes	4,217	2,046	8,139	4,846
Net income	11,778	5,240	22,634	12,529
Capital expenditures	2,256	2,016	6,644	4,194
Banking [Member]
Segment Reporting Information [Line Items]
Total assets	4,366,362	2,925,285	4,366,362	2,925,285	4,137,873
Interest income	40,022	26,104	78,414	51,829
Interest expense	4,730	2,163	8,843	4,374
Net interest income	35,292	23,941	69,571	47,455
Provision for loan and lease losses	2,766	830	5,211	1,156
Noninterest income	6,790	5,492	11,952	10,040
Intangible expenses	398	61	794	124
Acquisition-related and integration costs and restructuring charges		38		48
Other noninterest expense	22,949	19,700	46,694	38,436
Intersegment (revenue) expense	(491)	(479)	(1,058)	(990)
Income before income taxes	16,460	9,283	29,882	18,721
Income taxes	4,279	2,291	7,920	4,648
Net income	12,181	6,992	21,962	14,073
Capital expenditures	2,019	1,481	6,339	3,320
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	32,806	31,392	32,806	31,392	35,061
Interest income	1	1	2	3
Interest expense	0	0	0	0
Net interest income	1	1	2	3
Provision for loan and lease losses	0	0	0	0
Noninterest income	5,399	4,812	10,537	9,384
Intangible expenses	168	304	338	607
Acquisition-related and integration costs and restructuring charges		0		0
Other noninterest expense	3,462	3,247	6,932	6,305
Intersegment (revenue) expense	195	211	432	430
Income before income taxes	1,575	1,051	2,837	2,045
Income taxes	627	395	1,127	778
Net income	948	656	1,710	1,267
Capital expenditures	11	9	22	24
Insurance [Member]
Segment Reporting Information [Line Items]
Total assets	25,241	25,309	25,241	25,309	24,472
Interest income	0	0	0	0
Interest expense	0	0	0	0
Net interest income	0	0	0	0
Provision for loan and lease losses	0	0	0	0
Noninterest income	3,746	3,620	8,293	8,340
Intangible expenses	(120)	626	73	1,026
Acquisition-related and integration costs and restructuring charges		0		0
Other noninterest expense	2,846	2,937	5,915	6,056
Intersegment (revenue) expense	296	268	626	560
Income before income taxes	724	(211)	1,679	698
Income taxes	305	(81)	709	296
Net income	419	(130)	970	402
Capital expenditures	192	11	199	21
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	29,118	125,631	29,118	125,631	$ 33,122
Interest income	7	7	10	14
Interest expense	0	288	0	288
Net interest income	7	(281)	10	(274)
Provision for loan and lease losses	0	0	0	0
Noninterest income	74	77	197	68
Intangible expenses	0	0	0	0
Acquisition-related and integration costs and restructuring charges		1,147		1,357
Other noninterest expense	2,845	1,486	3,832	2,526
Intersegment (revenue) expense	0	0	0	0
Income before income taxes	(2,764)	(2,837)	(3,625)	(4,089)
Income taxes	(994)	(559)	(1,617)	(876)
Net income	(1,770)	(2,278)	(2,008)	(3,213)
Capital expenditures	$ 34	$ 515	$ 84	$ 829