Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income
Interest and fees on loans	$ 141,314	$ 77,578	$ 273,799	$ 151,979
Interest on investment securities:
Taxable	7,125	1,798	11,881	3,727
Tax-exempt	4,426	2,640	8,661	5,305
Dividends on nonmarketable equity securities	1,246	777	1,867	1,033
Interest on deposits with the Federal Reserve Bank, other banks and Federal funds sold	1,022	144	1,821	357
Total interest income	155,133	82,937	298,029	162,401
Interest expense
Interest on deposits	10,582	4,260	19,498	8,319
Interest on short-term borrowings	4,659	226	6,317	326
Interest on long-term borrowings	1,944	956	4,169	1,931
Total interest expense	17,185	5,442	29,984	10,576
Net interest income	137,948	77,495	268,045	151,825
Provision for loan losses	6,229	3,000	10,279	4,500
Net interest income after provision for loan losses	131,719	74,495	257,766	147,325
Noninterest income
Service charges and fees on deposit accounts	8,777	6,337	16,781	12,057
Wealth management revenue	6,958	5,782	12,785	10,983
Other charges and fees for customer services	9,734	6,463	18,625	12,855
Net gain on sale of loans and other mortgage banking revenue	9,879	1,595	19,039	3,000
Gain on sale of investment securities	77	18	167	37
Other	6,143	702	12,181	1,384
Total noninterest income	41,568	20,897	79,578	40,316
Operating expenses
Salaries, wages and employee benefits	52,601	33,127	112,849	67,017
Occupancy	8,745	5,514	16,137	10,419
Equipment and software	8,149	4,875	16,666	9,279
Merger and acquisition-related transaction expenses	465	3,054	4,632	5,648
Other	28,277	12,515	52,149	25,609
Total operating expenses	98,237	59,085	202,433	117,972
Income before income taxes	75,050	36,307	134,911	69,669
Income tax expense	23,036	10,532	35,293	20,289
Net income	$ 52,014	$ 25,775	$ 99,618	$ 49,380
Earnings per common share:
Basic (dollars per share)	$ 0.73	$ 0.67	$ 1.41	$ 1.29
Diluted (dollars per share)	0.73	0.67	1.39	1.28
Cash dividends declared per common share (dollars per share)	$ 0.27	$ 0.26	$ 0.54	$ 0.52