Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Interest income:
Loans and leases	$ 224,178	$ 238,223	$ 236,375
Investment securities	23,039	23,403	22,547
Deposits in financial institutions	192	147	308
Total interest income	247,409	261,773	259,230
Interest expense:
Deposits	8,377	7,369	9,073
Borrowings	1,018	631	581
Subordinated debentures	5,562	5,468	4,982
Total interest expense	14,957	13,468	14,636
Net interest income	232,452	248,305	244,594
Provision for credit losses	24,728	23,215	20,140
Net interest income after provision for credit losses	207,724	225,090	224,454
Noninterest income:
Service charges on deposit accounts	3,758	3,557	3,856
Other commissions and fees	10,390	12,036	11,489
Leased equipment income	9,475	8,614	8,244
Gain on sale of loans and leases	712	119	245
Gain (loss) on sale of securities	(99)	515	8,110
FDIC loss sharing expense, net	0	0	(2,415)
Other income	10,878	4,054	5,010
Total noninterest income	35,114	28,895	34,539
Noninterest expense:
Compensation	64,880	66,013	61,065
Occupancy	11,608	12,076	12,632
Data processing	7,015	6,574	5,904
Other professional services	3,378	4,880	3,572
Insurance and assessments	4,791	4,124	4,965
Intangible asset amortization	3,064	3,176	4,746
Leased equipment depreciation	5,625	5,291	5,024
Foreclosed assets expense (income), net	143	2,693	(561)
Acquisition, integration and reorganization costs	500	0	200
Other expense	15,540	13,795	13,141
Total noninterest expense	116,544	118,622	110,688
Earnings before income taxes	126,294	135,363	148,305
Income tax expense	(47,626)	(49,716)	(57,849)
Net earnings	$ 78,668	$ 85,647	$ 90,456
Earnings per share:
Net earnings (usd per share)	$ 0.65	$ 0.71	$ 0.74
Net earnings (usd per share)	0.65	0.71	0.74
Dividends declared per share (usd per share)	$ 0.50	$ 0.50	$ 0.5