Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest income:
Loans and leases	$ 244,529	$ 241,544	$ 247,851	$ 486,073	$ 510,129
Investment securities	33,954	30,265	26,038	64,219	53,484
Deposits in financial institutions	2,022	1,528	186	3,550	1,794
Total interest income	280,505	273,337	274,075	553,842	565,407
Interest expense:
Deposits	7,269	7,500	13,075	14,769	41,322
Borrowings	265	193	1,319	458	8,097
Subordinated debt	6,663	4,375	5,402	11,038	11,962
Total interest expense	14,197	12,068	19,796	26,265	61,381
Net interest income	266,308	261,269	254,279	527,577	504,026
Provision for credit losses	(88,000)	(48,000)	120,000	(136,000)	232,000
Net interest income after provision for credit losses	354,308	309,269	134,279	663,577	272,026
Noninterest income:
Leased equipment income	10,704	9,158	10,111	19,862	19,832
Other commissions and fees	10,847	11,354	12,037	22,201	24,288
Service charges on deposit accounts	3,452	2,934	2,004	6,386	4,662
Gain on sale of loans and leases	1,422	139	346	1,561	433
Gain on sale of securities	0	101	7,715	101	7,897
Other income	13,946	21,143	6,645	35,089	10,846
Total noninterest income	40,371	44,829	38,858	85,200	67,958
Noninterest expense:
Compensation	90,807	79,882	61,910	170,689	123,192
Occupancy	14,784	14,054	14,494	28,838	28,701
Leased equipment depreciation	8,614	8,969	7,102	17,583	14,307
Data processing	7,758	6,957	7,102	14,715	13,556
Other professional services	5,256	5,126	4,146	10,382	8,404
Insurance and assessments	3,745	4,903	9,373	8,648	13,622
Customer related expense	4,973	4,818	4,408	9,791	8,340
Loan expense	4,031	3,193	3,379	7,224	6,029
Intangible asset amortization	2,889	3,079	3,882	5,968	7,830
Acquisition, integration and reorganization costs	200	3,425	0	3,625	0
Foreclosed assets (income) expense, net	(119)	1	(146)	(118)	(80)
Goodwill impairment	0	0	0	0	1,470,000
Other expense	8,812	15,729	11,315	24,541	21,034
Total noninterest expense	151,750	150,136	126,965	301,886	1,714,935
Earnings (loss) before income taxes	242,929	203,962	46,172	446,891	(1,374,951)
Income tax expense	(62,417)	(53,556)	(12,968)	(115,973)	(24,956)
Net earnings (loss)	$ 180,512	$ 150,406	$ 33,204	$ 330,918	$ (1,399,907)
Earnings (loss) per share:
Basic (usd per share)	$ 1.52	$ 1.27	$ 0.28	$ 2.78	$ (11.98)
Diluted (usd per share)	$ 1.52	$ 1.27	$ 0.28	$ 2.78	$ (11.98)