Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest income
Interest and fees on loans	$ 167,697	$ 174,049
Interest and dividends on investment securities
Taxable	16,472	7,014
Tax-exempt	16,108	14,162
Other interest	1,993	1,694
Total interest income	202,270	196,920
Interest expense
Interest on deposits	3,571	5,909
Interest on federal funds purchased and securities sold under agreements to repurchase	38	26
Interest on other short-term funding	1	6
Interest on FHLB advances	8,182	9,493
Interest on long-term funding	2,730	5,585
Total interest expense	14,522	21,018
Net interest income	187,747	175,902
Provision for credit losses	(3,990)	(23,004)
Net interest income after provision for credit losses	191,737	198,906
Noninterest income
Noninterest Income In Scope of Topic 606	52,344	51,762
Capital markets, net	8,646	8,118
Mortgage banking, net	8,391	23,925
Bank and corporate owned life insurance	2,071	2,702
Asset gains, net	188	4,809
Gains on sale of branches, net(a)	0	1,002
Gain (Loss) on Sale of Debt Investments	21	(39)
Other	2,198	3,216
Total noninterest income	74,467	95,343
Noninterest expense
Personnel	104,811	104,026
Technology	21,485	20,740
Occupancy	16,080	16,156
Business development and advertising	4,954	4,395
Equipment	4,960	5,518
Legal and professional	5,087	6,530
Loan and foreclosure costs	2,014	2,220
FDIC assessment	5,100	4,750
Other intangible amortization	2,203	2,236
Other	6,597	8,775
Total noninterest expense	173,292	175,347
Income before income taxes	92,912	118,903
Income tax expense	18,650	24,602
Net income	74,262	94,301
Preferred stock dividends	2,875	5,207
Net income available to common equity	$ 71,387	$ 89,094
Earnings per common share
Basic	$ 0.48	$ 0.58
Diluted	$ 0.47	$ 0.58
Average common shares outstanding
Basic	148,781	152,355
Diluted	150,492	153,688
Wealth management fees
Noninterest income
Noninterest Income In Scope of Topic 606	$ 22,404	$ 22,414
Service charges and deposit account fees
Noninterest income
Noninterest Income In Scope of Topic 606	16,856	14,855
Card-based fees
Noninterest income
Noninterest Income In Scope of Topic 606	9,949	9,764
Card-based fees	9,926	9,743
Other fee-based revenue
Noninterest income
Noninterest Income In Scope of Topic 606	3,135	4,729
Card-based fees	3,766	4,596
Operating Segments | Risk Management and Shared Services
Interest expense
Net interest income	27,570	14,465
Provision for credit losses	(21,300)	(45,612)
Noninterest income
Total noninterest income	3,470	6,184
Noninterest expense
Total noninterest expense	18,073	19,546
Income before income taxes	6,909	27,156
Income tax expense	2,501	6,890
Net income	$ 4,409	$ 20,266