Segment Information - Schedule of Segment Information (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]
Net interest income	$ 102,004	$ 96,377	$ 199,594	$ 191,117
Provision for loan losses, net	357	3,203	1,514	6,755
Noninterest income	50,190	44,227	96,223	87,503
Noninterest expense	122,075	110,179	224,132	209,123
Income Before Income Taxes	29,762	27,222	70,171	62,742
Income taxes	5,727	5,719	14,888	14,236
Net Income	24,035	21,503	55,283	48,506
Selected Financial Information
Total assets	13,909,138	13,030,349	13,909,138	13,030,349	$ 13,352,333
Depreciation and amortization	9,698	8,958	18,729	17,679
General Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	101,794	96,113	199,205	190,555
Provision for loan losses, net	357	3,203	1,514	6,755
Noninterest income	32,820	26,629	62,260	54,023
Noninterest expense	108,249	96,812	195,606	182,705
Income Before Income Taxes	26,008	22,727	64,345	55,118
Income taxes	4,273	4,005	12,642	11,324
Net Income	21,735	18,722	51,703	43,794
Selected Financial Information
Total assets	13,837,564	12,955,555	13,837,564	12,955,555
Depreciation and amortization	9,497	8,724	18,333	17,209
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income	155	207	284	452
Noninterest income	7,624	7,959	15,001	15,247
Noninterest expense	6,369	6,093	13,570	11,984
Income Before Income Taxes	1,410	2,073	1,715	3,715
Income taxes	541	793	657	1,421
Net Income	869	1,280	1,058	2,294
Selected Financial Information
Total assets	7,014	7,497	7,014	7,497
Depreciation and amortization	37	43	74	87
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income	55	57	105	110
Noninterest income	9,746	9,639	18,962	18,233
Noninterest expense	7,457	7,274	14,956	14,434
Income Before Income Taxes	2,344	2,422	4,111	3,909
Income taxes	913	921	1,589	1,491
Net Income	1,431	1,501	2,522	2,418
Selected Financial Information
Total assets	64,560	67,297	64,560	67,297
Depreciation and amortization	$ 164	$ 191	$ 322	$ 383