Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income:
Loans, including fees	$ 243,233	$ 215,161	$ 481,515	$ 421,008
Loans held for sale	344	295	597	516
Securities-taxable	30,244	30,783	61,383	60,084
Securities-tax exempt	5,211	5,490	10,657	11,027
Short-term investments	1,346	575	2,509	1,064
Total interest income	280,378	252,304	556,661	493,699
Interest expense:
Deposits	49,843	29,870	95,981	56,829
Short-term borrowings	7,847	7,416	15,929	12,767
Long-term debt	2,820	3,471	5,629	6,892
Total interest expense	60,510	40,757	117,539	76,488
Net interest income	219,868	211,547	439,122	417,211
Provision for loan losses	8,088	8,891	26,131	21,144
Net interest income after provision for loan losses	211,780	202,656	412,991	396,067
Noninterest income:
Other income	14,980	10,505	24,448	19,990
Total noninterest income	79,250	68,832	149,753	135,084
Noninterest expense:
Compensation expense	87,747	79,885	171,715	159,985
Employee benefits	18,888	17,358	38,618	37,232
Personnel expense	106,635	97,243	210,333	197,217
Net occupancy expense	12,961	12,316	24,945	23,326
Equipment expense	4,342	4,262	9,021	7,808
Data processing expense	20,088	18,273	39,419	34,722
Professional services expense	9,665	13,381	17,833	22,636
Amortization of intangible assets	5,047	5,322	10,185	10,940
Deposit insurance and regulatory fees	4,755	8,376	10,161	16,324
Other real estate (income) expense	395	(289)	(596)	(79)
Other expense	19,679	25,518	37,966	42,299
Total noninterest expense	183,567	184,402	359,267	355,193
Income before income taxes	107,463	87,086	203,477	175,958
Income taxes	19,186	15,909	36,036	32,306
Net income	$ 88,277	$ 71,177	$ 167,441	$ 143,652
Earnings per common share-basic	$ 1.01	$ 0.82	$ 1.92	$ 1.65
Earnings per common share-diluted	1.01	0.82	1.92	1.65
Dividends paid per share	$ 0.27	$ 0.24	$ 0.54	$ 0.48
Weighted average shares outstanding-basic	85,728	85,305	85,708	85,273
Weighted average shares outstanding-diluted	85,835	85,483	85,810	85,451
Service charges on deposit accounts
Noninterest income:
Service charges on deposit accounts	$ 20,723	$ 20,981	$ 41,090	$ 42,429
Trust fees
Noninterest income:
Service charges on deposit accounts	15,904	11,653	31,028	22,988
Bank card and ATM fees
Noninterest income:
Service charges on deposit accounts	16,619	15,464	31,909	29,922
Investment and annuity fees and insurance commissions
Noninterest income:
Service charges on deposit accounts	6,591	6,264	13,119	12,389
Secondary mortgage market operations
Noninterest income:
Service charges on deposit accounts	$ 4,433	$ 3,965	$ 8,159	$ 7,366