Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Loans, including fees	$ 238,723	$ 238,282
Loans held for sale	621	253
Securities-taxable	32,607	31,139
Securities-tax exempt	4,944	5,446
Short-term investments	448	1,163
Total interest income	277,343	276,283
Interest expense:
Deposits	38,937	46,138
Short-term borrowings	4,462	8,082
Long-term debt	2,756	2,809
Total interest expense	46,155	57,029
Net interest income	231,188	219,254
Provision for credit losses	246,793	18,043
Net interest income (loss) after provision for credit losses	(15,605)	201,211
Noninterest income:
Other income	16,179	9,468
Total noninterest income	84,387	70,503
Noninterest expense:
Compensation expense	91,071	83,968
Employee benefits	22,478	19,730
Personnel expense	113,549	103,698
Net occupancy expense	12,522	11,984
Equipment expense	4,617	4,679
Data processing expense	22,047	19,331
Professional services expense	9,741	8,168
Amortization of intangible assets	5,345	5,138
Deposit insurance and regulatory fees	5,815	5,406
Other real estate and foreclosed assets (income) expense	10,130	(991)
Other expense	19,569	18,287
Total noninterest expense	203,335	175,700
Income (loss) before income taxes	(134,553)	96,014
Income taxes expense (benefit)	(23,520)	16,850
Net income (loss)	$ (111,033)	$ 79,164
Earnings (loss) per common share-basic	$ (1.28)	$ 0.91
Earnings (loss) per common share-diluted	(1.28)	0.91
Dividends paid per share	$ 0.27	$ 0.27
Weighted average shares outstanding-basic	87,186	85,688
Weighted average shares outstanding-diluted	87,186	85,800
Service charges on deposit accounts
Noninterest income:
Service charges on deposit accounts	$ 22,837	$ 20,367
Trust fees
Noninterest income:
Service charges on deposit accounts	14,806	15,124
Bank card and ATM fees
Noninterest income:
Service charges on deposit accounts	17,362	15,290
Investment and annuity fees and insurance commissions
Noninterest income:
Service charges on deposit accounts	7,150	6,528
Secondary mortgage market operations
Noninterest income:
Service charges on deposit accounts	$ 6,053	$ 3,726