Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest income
Interest and fees on loans	$ 199,876	$ 174,228	$ 367,573	$ 348,277
Interest and dividends on investment securities
Taxable	18,317	8,840	34,789	15,855
Tax-exempt	16,379	14,366	32,487	28,528
Other interest	2,420	1,826	4,413	3,521
Total interest income	236,991	199,260	439,261	396,180
Interest expense
Interest on deposits	8,019	4,609	11,591	10,519
Interest on federal funds purchased and securities sold under agreements to repurchase	406	30	444	55
Interest on other short-term funding	1	7	2	13
Interest on FHLB advances	9,689	9,524	17,871	19,017
Interest on long-term funding	2,730	5,575	5,460	11,160
Total interest expense	20,845	19,745	35,367	40,764
Net interest income	216,146	179,515	403,893	355,416
Provision for credit losses	(2)	(35,004)	(3,992)	(58,009)
Net interest income after provision for credit losses	216,148	214,519	407,886	413,425
Noninterest income
Noninterest Income In Scope of Topic 606	51,619	53,522	103,963	105,284
Capital markets, net	8,010	5,696	16,656	13,814
Mortgage banking, net	6,145	8,128	14,536	32,054
Bank and corporate owned life insurance	4,106	3,088	6,177	5,791
Asset gains (losses), net	1,677	(14)	1,865	4,796
Investment securities gains (losses), net	(8)	24	12	(16)
Gains on sale of branches, net(a)	0	36	0	1,038
Other	1,888	3,004	4,086	6,221
Total noninterest income	75,458	73,443	149,925	168,786
Noninterest expense
Personnel	112,666	106,994	217,477	211,020
Technology	21,223	20,236	42,707	40,975
Occupancy	14,151	14,679	30,231	30,835
Business development and advertising	5,655	4,970	10,610	9,366
Equipment	4,960	5,481	9,920	10,999
Legal and professional	4,873	6,661	9,960	13,191
Loan and foreclosure costs	1,476	2,671	3,490	4,891
FDIC assessment	5,400	3,600	10,500	8,350
Other intangible amortization	2,203	2,203	4,405	4,439
Other	8,815	6,979	15,412	15,755
Total noninterest expense	181,420	174,475	354,712	349,821
Income before income taxes	110,187	113,487	203,099	232,389
Income tax expense	23,363	22,480	42,013	47,082
Net income	86,824	91,007	161,086	185,307
Preferred stock dividends	2,875	4,875	5,750	10,082
Net income available to common equity	$ 83,949	$ 86,131	$ 155,336	$ 175,226
Earnings per common share
Basic	$ 0.56	$ 0.56	$ 1.04	$ 1.14
Diluted	$ 0.56	$ 0.56	$ 1.03	$ 1.13
Average common shares outstanding
Basic	149,083	152,042	148,933	152,198
Diluted	150,203	153,381	150,265	153,473
Wealth management fees
Noninterest income
Noninterest Income In Scope of Topic 606	$ 21,332	$ 22,706	$ 43,735	$ 45,120
Service charges and deposit account fees
Noninterest income
Noninterest Income In Scope of Topic 606	16,506	15,549	33,363	30,404
Card-based fees
Noninterest income
Noninterest Income In Scope of Topic 606	11,472	11,009	21,421	20,773
Card-based fees	11,442	10,982	21,368	20,725
Other fee-based revenue
Noninterest income
Noninterest Income In Scope of Topic 606	2,309	4,258	5,444	8,987
Card-based fees	$ 4,360	$ 4,244	$ 8,126	$ 8,840