Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest income:
Loans and leases	$ 247,851	$ 262,278	$ 284,236	$ 510,129	$ 558,465
Investment securities	26,038	27,446	28,948	53,484	58,628
Deposits in financial institutions	186	1,608	1,349	1,794	1,999
Total interest income	274,075	291,332	314,533	565,407	619,092
Interest expense:
Deposits	13,075	28,247	38,720	41,322	72,955
Borrowings	1,319	6,778	7,210	8,097	14,920
Subordinated debentures	5,402	6,560	7,705	11,962	15,443
Total interest expense	19,796	41,585	53,635	61,381	103,318
Net interest income	254,279	249,747	260,898	504,026	515,774
Provision for credit losses	120,000	112,000	8,000	232,000	12,000
Net interest income after provision for credit losses	134,279	137,747	252,898	272,026	503,774
Noninterest income:
Other commissions and fees	10,111	9,721	11,590	19,832	22,598
Leased equipment income	12,037	12,251	9,182	24,288	18,464
Service charges on deposit accounts	2,004	2,658	3,771	4,662	7,501
Gain on sale of loans and leases	346	87	326	433	326
Gain on sale of securities	7,715	182	22,192	7,897	24,353
Other income	6,645	4,201	3,832	10,846	8,715
Total noninterest income	38,858	29,100	50,893	67,958	81,957
Noninterest expense:
Compensation	61,910	61,282	68,956	123,192	139,801
Occupancy	14,494	14,207	14,457	28,701	28,777
Data processing	7,102	6,454	6,817	13,556	13,742
Leased equipment depreciation	7,102	7,205	5,558	14,307	11,209
Intangible asset amortization	3,882	3,948	4,870	7,830	9,740
Other professional services	4,146	4,258	4,629	8,404	9,142
Insurance and assessments	9,373	4,249	4,098	13,622	8,136
Customer related expense	4,408	3,932	3,405	8,340	6,348
Loan expense	3,379	2,650	3,451	6,029	6,336
Acquisition, integration and reorganization costs	0	0	0	0	618
Foreclosed assets (income) expense, net	(146)	66	(146)	(80)	(117)
Goodwill impairment	0	1,470,000	0	1,470,000	0
Other expense	11,315	9,719	9,332	21,034	17,982
Total noninterest expense	126,965	1,587,970	125,427	1,714,935	251,714
Earnings (loss) before income taxes	46,172	(1,421,123)	178,364	(1,374,951)	334,017
Income tax expense	(12,968)	(11,988)	(50,239)	(24,956)	(93,288)
Net earnings (loss)	$ 33,204	$ (1,433,111)	$ 128,125	$ (1,399,907)	$ 240,729
Earnings (loss) per share:
Basic (usd per share)	$ 0.28	$ (12.23)	$ 1.07	$ (11.98)	$ 1.99
Diluted (usd per share)	$ 0.28	$ (12.23)	$ 1.07	$ (11.98)	$ 1.99