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 [Abstract]
Reportable business segments | segment			3
Segment Reporting Information [Line Items]
Total assets	$ 4,417,363	$ 4,140,444	$ 4,417,363	$ 4,140,444	$ 4,230,528
Interest income	42,172	36,705	120,598	88,551
Interest expense	5,285	3,836	14,128	8,498
Net interest income	36,887	32,869	106,470	80,053
Provision for loan and lease losses	2,689	1,415	7,900	2,571
Noninterest income	14,109	14,137	45,088	41,969
Intangible expenses	690	854	1,895	2,611
Acquisition-related and integration costs and restructuring charges		14,064		15,469
Other noninterest expense	32,005	32,148	95,378	85,471
Intersegment (revenue) expense	0	0	0	0
Income before income taxes	15,612	(1,475)	46,385	15,900
Income tax expense (benefit)	4,416	(1,533)	12,555	3,313
Net income	11,196	58	33,830	12,587
Capital expenditures	768	3,500	7,412	7,694
Banking [Member]
Segment Reporting Information [Line Items]
Total assets	4,327,920	4,045,419	4,327,920	4,045,419	4,137,873
Interest income	42,161	36,697	120,575	88,526
Interest expense	5,285	3,836	14,128	8,210
Net interest income	36,876	32,861	106,447	80,316
Provision for loan and lease losses	2,689	1,415	7,900	2,571
Noninterest income	4,993	5,802	16,945	15,842
Intangible expenses	357	403	1,151	527
Acquisition-related and integration costs and restructuring charges		14,156		14,204
Other noninterest expense	24,479	23,580	71,173	62,016
Intersegment (revenue) expense	(611)	(292)	(1,669)	(1,282)
Income before income taxes	14,955	(599)	44,837	18,122
Income tax expense (benefit)	4,166	(1,375)	12,086	3,273
Net income	10,789	776	32,751	14,849
Capital expenditures	582	2,814	6,921	6,134
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	34,903	32,721	34,903	32,721	35,061
Interest income	4	1	6	4
Interest expense	0	0	0	0
Net interest income	4	1	6	4
Provision for loan and lease losses	0	0	0	0
Noninterest income	5,428	4,902	15,965	14,286
Intangible expenses	168	231	506	838
Acquisition-related and integration costs and restructuring charges		0		0
Other noninterest expense	3,472	3,437	10,404	9,742
Intersegment (revenue) expense	261	133	693	563
Income before income taxes	1,531	1,102	4,368	3,147
Income tax expense (benefit)	611	413	1,738	1,191
Net income	920	689	2,630	1,956
Capital expenditures	5	5	27	29
Insurance [Member]
Segment Reporting Information [Line Items]
Total assets	25,139	23,830	25,139	23,830	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	3,620	3,396	11,913	11,736
Intangible expenses	165	220	238	1,246
Acquisition-related and integration costs and restructuring charges		0		0
Other noninterest expense	2,803	2,906	8,718	8,962
Intersegment (revenue) expense	350	159	976	719
Income before income taxes	302	111	1,981	809
Income tax expense (benefit)	128	61	837	357
Net income	174	50	1,144	452
Capital expenditures	3	9	202	30
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	29,401	38,474	29,401	38,474	$ 33,122
Interest income	7	7	17	21
Interest expense	0	0	0	288
Net interest income	7	7	17	(267)
Provision for loan and lease losses	0	0	0	0
Noninterest income	68	37	265	105
Intangible expenses	0	0	0	0
Acquisition-related and integration costs and restructuring charges		(92)		1,265
Other noninterest expense	1,251	2,225	5,083	4,751
Intersegment (revenue) expense	0	0	0	0
Income before income taxes	(1,176)	(2,089)	(4,801)	(6,178)
Income tax expense (benefit)	(489)	(632)	(2,106)	(1,508)
Net income	(687)	(1,457)	(2,695)	(4,670)
Capital expenditures	$ 178	$ 672	$ 262	$ 1,501