CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income:
Loans, including fees	$ 227,372	$ 236,420
Securities:
Taxable	7,728	10,268
Tax-exempt	15,498	13,824
Federal funds sold and other	1,319	2,557
Total interest income	251,917	263,069
Interest expense:
Deposits	17,468	50,698
Securities sold under agreements to repurchase	72	115
Federal Home Loan Bank advances and other borrowings	11,507	18,704
Total interest expense	29,047	69,517
Net interest income	222,870	193,552
Provision for credit losses	7,235	99,889
Net interest income after provision for credit losses	215,635	93,663
Noninterest income:
Total noninterest income	92,709	70,377
Noninterest expense:
Salaries and employee benefits	102,728	80,480
Equipment and occupancy	23,220	20,978
Other real estate (income) expense, net	(13)	2,415
Marketing and other business development	2,349	3,251
Postage and supplies	1,806	1,990
Amortization of intangibles	2,206	2,520
Other noninterest expense	22,400	25,715
Total noninterest expense	154,696	137,349
Income before income taxes	153,648	26,691
Income tax expense (benefit)	28,220	(1,665)
Net income	125,428	28,356
Preferred stock dividends	(3,798)	0
Net income available to common shareholders	$ 121,630	$ 28,356
Per share information:
Basic net income per common share (in dollars per share)	$ 1.61	$ 0.37
Diluted net income per common share (in dollars per share)	$ 1.61	$ 0.37
Weighted average common shares outstanding:
Basic (in shares)	75,372,883	75,803,402
Diluted (in shares)	75,657,149	75,966,295
Service charges on deposit accounts
Noninterest income:
Total noninterest income	$ 8,307	$ 9,032
Investment services
Noninterest income:
Total noninterest income	8,191	9,239
Insurance sales commissions
Noninterest income:
Total noninterest income	3,225	3,240
Gain on mortgage loans sold, net
Noninterest income:
Total noninterest income	13,666	8,583
Investment gains on sales, net
Noninterest income:
Total noninterest income	0	463
Trust fees
Noninterest income:
Total noninterest income	4,687	4,170
Income from equity method investment
Noninterest income:
Total noninterest income	28,950	15,592
Other noninterest income
Noninterest income:
Total noninterest income	$ 25,683	$ 20,058