Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest income:
Loans, including fees	$ 192,750	$ 213,713
Loans held for sale	691	671
Securities-taxable	37,164	31,203
Securities-tax exempt	4,655	4,783
Short-term investments	1,526	415
Total interest income	236,786	250,785
Interest expense:
Deposits	3,778	9,227
Short-term borrowings	1,419	1,533
Long-term debt	3,126	5,438
Total interest expense	8,323	16,198
Net interest income	228,463	234,587
Provision for credit losses	(22,527)	(4,911)
Net interest income after provision for credit losses	250,990	239,498
Noninterest income:
Securities transactions, net	(87)
Other income	14,997	15,652
Total noninterest income	83,432	87,089
Noninterest expense:
Compensation expense	85,993	95,846
Employee benefits	21,403	23,769
Personnel expense	107,396	119,615
Net occupancy expense	11,680	12,910
Equipment expense	4,867	4,781
Data processing expense	24,239	22,947
Professional services expense	7,793	11,251
Amortization of intangible assets	3,748	4,419
Deposit insurance and regulatory fees	3,740	3,395
Other real estate and foreclosed assets expense (income)	(1,764)	(6)
Other expense	18,240	13,748
Total noninterest expense	179,939	193,072
Income before income taxes	154,483	133,515
Income taxes expense	31,005	26,343
Net income	$ 123,478	$ 107,172
Earnings per common share-basic	$ 1.40	$ 1.21
Earnings per common share-diluted	1.40	1.21
Dividends paid per share	$ 0.27	$ 0.27
Weighted average shares outstanding-basic	86,660	86,752
Weighted average shares outstanding-diluted	86,936	86,805
Service charges on deposit accounts
Noninterest income:
Service charges on deposit accounts	$ 21,674	$ 19,146
Trust fees
Noninterest income:
Service charges on deposit accounts	15,279	15,003
Bank card and ATM fees
Noninterest income:
Service charges on deposit accounts	20,396	18,120
Investment and annuity fees and insurance commissions
Noninterest income:
Service charges on deposit accounts	7,427	7,458
Secondary mortgage market operations
Noninterest income:
Service charges on deposit accounts	$ 3,746	$ 11,710