Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income	$ 97,590	$ 94,740
Provision for loan losses, net	1,157	3,552
Noninterest income	46,033	43,276
Noninterest expense	102,057	98,944
Income Before Income Taxes	40,409	35,520
Income taxes	9,161	8,517
Net Income	31,248	27,003
Selected Financial Information
Total assets	13,490,361	12,775,196	$ 13,352,333
Depreciation and amortization	9,031	8,721
General Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	97,411	94,442
Provision for loan losses, net	1,157	3,552
Noninterest income	29,440	27,394
Noninterest expense	87,357	85,893
Income Before Income Taxes	38,337	32,391
Income taxes	8,369	7,319
Net Income	29,968	25,072
Selected Financial Information
Total assets	13,417,229	12,701,364
Depreciation and amortization	8,836	8,485
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income	129	245
Noninterest income	7,377	7,288
Noninterest expense	7,201	5,891
Income Before Income Taxes	305	1,642
Income taxes	116	628
Net Income	189	1,014
Selected Financial Information
Total assets	7,279	7,329
Depreciation and amortization	37	44
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income	50	53
Noninterest income	9,216	8,594
Noninterest expense	7,499	7,160
Income Before Income Taxes	1,767	1,487
Income taxes	676	570
Net Income	1,091	917
Selected Financial Information
Total assets	65,853	66,503
Depreciation and amortization	$ 158	$ 192