Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income
Interest and fees on loans	$ 148,771	$ 97,103	$ 422,570	$ 249,082
Interest on investment securities:
Taxable	9,326	2,575	21,207	6,302
Tax-exempt	4,577	3,072	13,238	8,377
Dividends on nonmarketable equity securities	1,039	358	2,906	1,391
Interest on deposits with the Federal Reserve Bank, other banks and Federal funds sold	1,231	454	3,052	811
Total interest income	164,944	103,562	462,973	265,963
Interest expense
Interest on deposits	12,926	5,836	32,424	14,155
Interest on short-term borrowings	6,591	459	12,908	785
Interest on long-term borrowings	1,799	458	5,968	2,389
Total interest expense	21,316	6,753	51,300	17,329
Net interest income	143,628	96,809	411,673	248,634
Provision for loan losses	5,499	4,103	15,778	8,603
Net interest income after provision for loan losses	138,129	92,706	395,895	240,031
Noninterest income
Service charges and fees on deposit accounts	9,147	7,665	25,928	19,722
Wealth management revenue	6,188	5,584	18,973	16,567
Other charges and fees for customer services	6,624	7,410	25,249	20,265
Net gain on sale of loans and other mortgage banking revenue	5,241	4,439	24,280	7,439
Gain on sale of investment securities	1	16	168	53
Other	4,921	2,656	17,102	4,040
Total noninterest income	32,122	27,770	111,700	68,086
Operating expenses
Salaries, wages and employee benefits	52,621	40,565	165,470	107,582
Occupancy	6,871	5,462	23,008	15,881
Equipment and software	7,582	6,420	24,248	15,699
Merger expenses	2,379	37,470	7,011	43,118
Restructuring expenses	18,824	0	18,824	0
Other	31,262	16,227	83,411	41,836
Total operating expenses	119,539	106,144	321,972	224,116
Income before income taxes	50,712	14,332	185,623	84,001
Income tax expense	10,253	2,848	45,546	23,137
Net income	$ 40,459	$ 11,484	$ 140,077	$ 60,864
Earnings per common share:
Basic (dollars per share)	$ 0.57	$ 0.23	$ 1.98	$ 1.45
Diluted (dollars per share)	0.56	0.23	1.95	1.42
Cash dividends declared per common share (dollars per share)	$ 0.28	$ 0.27	$ 0.82	$ 0.79000