Segment Reporting - Schedule of Segment Reporting (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting [Abstract]
Number of reportable segments (in segments) | segment									3
Segment Reporting Information [Line Items]
Interest income	$ 42,417	$ 42,172	$ 40,030	$ 38,396	$ 38,056	$ 36,705	$ 26,112	$ 25,734	$ 163,015	$ 126,607	$ 101,983
Interest expense	5,711	5,285	4,730	4,113	3,884	3,836	2,451	2,211	19,839	12,382	8,065
Net interest income	36,706	36,887	35,300	34,283	34,172	32,869	23,661	23,523	143,176	114,225	93,918
Provision for loan and lease losses	1,992	2,689	2,766	2,445	2,250	1,415	830	326	9,892	4,821	3,802
Noninterest income	14,152	14,109	16,009	14,970	13,994	14,137	14,001	13,831	59,240	55,963	52,425
Intangible expenses									2,582	5,528	2,567
Acquisition-related and integration costs and restructuring charges										17,655	4,179
Other noninterest expense									128,131	118,798	98,769
Intersegment (revenue) expense									0	0	0
Income before income taxes	15,426	15,612	15,995	14,778	7,486	(1,475)	7,286	10,089	61,811	23,386	37,026
Income taxes	5,162	4,416	4,217	3,922	568	(1,533)	2,046	2,800	17,717	3,881	9,758
Net income	10,264	$ 11,196	$ 11,778	$ 10,856	6,918	$ 58	$ 5,240	$ 7,289	44,094	19,505	27,268
Total assets	4,554,862				4,230,528				4,554,862	4,230,528
Capital expenditures									8,603	11,663	6,730
Banking [Member]
Segment Reporting Information [Line Items]
Interest income									162,982	126,571	101,950
Interest expense									14,802	8,224	6,042
Net interest income									148,180	118,347	95,908
Provision for loan and lease losses									9,892	4,821	3,802
Noninterest income									21,838	21,296	18,934
Intangible expenses									1,507	932	293
Acquisition-related and integration costs and restructuring charges										16,096	1,992
Other noninterest expense									100,670	88,065	78,122
Intersegment (revenue) expense									(1,059)	(1,766)	(2,115)
Income before income taxes									59,008	31,495	32,748
Income taxes									15,735	6,510	7,693
Net income									43,273	24,985	25,055
Total assets	4,466,301				4,137,873				4,466,301	4,137,873
Capital expenditures									7,731	9,944	5,003
Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income									8	5	1
Interest expense									0	0	0
Net interest income									8	5	1
Provision for loan and lease losses									0	0	0
Noninterest income									21,707	19,318	18,874
Intangible expenses									674	3,132	410
Acquisition-related and integration costs and restructuring charges										0	0
Other noninterest expense									13,732	12,980	12,276
Intersegment (revenue) expense									585	788	867
Income before income taxes									6,724	2,423	5,322
Income taxes									2,597	857	2,054
Net income									4,127	1,566	3,268
Total assets	34,600				35,061				34,600	35,061
Capital expenditures									38	29	19
Insurance [Member]
Segment Reporting Information [Line Items]
Interest income									0	0	0
Interest expense									0	0	0
Net interest income									0	0	0
Provision for loan and lease losses									0	0	0
Noninterest income									15,320	15,150	14,396
Intangible expenses									401	1,464	1,864
Acquisition-related and integration costs and restructuring charges										0	0
Other noninterest expense									11,667	11,924	10,849
Intersegment (revenue) expense									474	978	1,248
Income before income taxes									2,778	784	435
Income taxes									374	348	164
Net income									2,404	436	271
Total assets	27,846				24,472				27,846	24,472
Capital expenditures									222	30	58
Other Segments [Member]
Segment Reporting Information [Line Items]
Interest income									25	31	32
Interest expense									5,037	4,158	2,023
Net interest income									(5,012)	(4,127)	(1,991)
Provision for loan and lease losses									0	0	0
Noninterest income									375	199	221
Intangible expenses									0	0	0
Acquisition-related and integration costs and restructuring charges										1,559	2,187
Other noninterest expense									2,062	5,829	(2,478)
Intersegment (revenue) expense									0	0	0
Income before income taxes									(6,699)	(11,316)	(1,479)
Income taxes									(989)	(3,834)	(153)
Net income									(5,710)	(7,482)	(1,326)
Total assets	$ 26,115				$ 33,122				26,115	33,122
Capital expenditures									$ 612	$ 1,660	$ 1,650