Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income:
Loans and leases	$ 246,722	$ 244,529	$ 240,811	$ 732,795	$ 750,940
Investment securities	40,780	33,954	24,443	104,999	77,927
Deposits in financial institutions	2,580	2,022	654	6,130	2,448
Total interest income	290,082	280,505	265,908	843,924	831,315
Interest expense:
Deposits	6,417	7,269	9,887	21,186	51,209
Borrowings	101	265	27	559	8,124
Subordinated debt	7,722	6,663	4,670	18,760	16,632
Total interest expense	14,240	14,197	14,584	40,505	75,965
Net interest income	275,842	266,308	251,324	803,419	755,350
Provision for credit losses	(20,000)	(88,000)	97,000	(156,000)	329,000
Net interest income after provision for credit losses	295,842	354,308	154,324	959,419	426,350
Noninterest income:
Leased equipment income	11,792	10,704	10,541	31,654	30,373
Other commissions and fees	10,943	10,847	9,900	33,144	34,188
Service charges on deposit accounts	3,407	3,452	2,570	9,793	7,232
Gain on sale of loans and leases	0	1,422	35	1,561	468
Gain on sale of securities	515	0	5,270	616	13,167
Other income	24,688	13,946	9,936	59,777	20,782
Total noninterest income	51,345	40,371	38,252	136,545	106,210
Noninterest expense:
Compensation	98,061	90,807	75,131	268,750	198,323
Occupancy	14,928	14,784	14,771	43,766	43,472
Leased equipment depreciation	8,603	8,614	7,057	26,186	21,364
Data processing	7,391	7,758	6,505	22,106	20,061
Other professional services	5,164	5,256	4,713	15,546	13,117
Insurance and assessments	3,685	3,745	3,939	12,333	17,561
Customer related expense	4,538	4,973	4,762	14,329	13,102
Loan expense	4,180	4,031	3,499	11,404	9,528
Intangible asset amortization	2,890	2,889	3,751	8,858	11,581
Acquisition, integration and reorganization costs	200	200	0	3,825	0
Foreclosed assets expense (income), net	165	(119)	335	47	255
Goodwill impairment	0	0	0	0	1,470,000
Other expense	9,616	8,812	8,939	34,157	29,973
Total noninterest expense	159,421	151,750	133,402	461,307	1,848,337
Earnings (loss) before income taxes	187,766	242,929	59,174	634,657	(1,315,777)
Income tax expense	(47,770)	(62,417)	(13,671)	(163,743)	(38,627)
Net earnings (loss)	$ 139,996	$ 180,512	$ 45,503	$ 470,914	$ (1,354,404)
Earnings (loss) per share:
Basic (usd per share)	$ 1.17	$ 1.52	$ 0.38	$ 3.96	$ (11.60)
Diluted (usd per share)	$ 1.17	$ 1.52	$ 0.38	$ 3.96	$ (11.60)