Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Loans and leases	$ 235,666	$ 234,618	$ 225,370	$ 694,462	$ 686,071
Investment securities	24,762	24,689	22,187	72,490	67,154
Deposits in financial institutions	538	237	298	967	914
Total interest income	260,966	259,544	247,855	767,919	754,139
Interest expense:
Deposits	13,071	10,205	7,247	31,653	24,143
Borrowings	188	1,066	695	2,272	1,628
Subordinated debentures	6,017	5,800	5,278	17,379	15,382
Total interest expense	19,276	17,071	13,220	51,304	41,153
Net interest income	241,690	242,473	234,635	716,615	712,986
Provision for credit losses	15,119	11,499	8,471	51,346	42,514
Net interest income after provision for credit losses	226,571	230,974	226,164	665,269	670,472
Noninterest income:
Service charges on deposit accounts	3,465	3,510	3,488	10,733	10,977
Other commissions and fees	9,944	10,583	12,528	30,917	35,090
Leased equipment income	8,332	11,635	8,538	29,442	25,305
Gain on sale of loans and leases	2,848	649	157	4,209	790
Gain on sale of securities	1,236	1,651	382	2,788	8,970
FDIC loss sharing expense, net	0	0	0	0	(8,917)
Other income	5,557	7,254	1,827	23,689	11,365
Total noninterest income	31,382	35,282	26,920	101,778	83,580
Noninterest expense:
Compensation	64,413	65,288	62,661	194,581	185,900
Occupancy	12,729	11,811	12,010	36,148	36,835
Data processing	6,459	6,337	6,234	19,811	17,782
Other professional services	4,213	3,976	4,625	11,567	11,598
Insurance and assessments	4,702	4,856	4,324	14,349	14,240
Intangible asset amortization	3,049	3,065	4,224	9,178	13,341
Leased equipment depreciation	4,862	5,232	5,298	15,719	15,608
Foreclosed assets expense (income), net	2,191	(157)	(248)	2,177	(812)
Acquisition, integration and reorganization costs	1,450	1,700	0	3,650	200
Loan expense	3,421	3,884	1,931	10,692	6,231
Other expense	11,053	11,715	9,651	34,921	30,556
Total noninterest expense	118,542	117,707	110,710	352,793	331,479
Earnings before income taxes	139,411	148,549	142,374	414,254	422,573
Income tax expense	(37,945)	(54,902)	(48,479)	(140,473)	(156,054)
Net earnings	$ 101,466	$ 93,647	$ 93,895	$ 273,781	$ 266,519
Earnings per share:
Net earnings (usd per share)	$ 0.84	$ 0.77	$ 0.77	$ 2.26	$ 2.19
Net earnings (usd per share)	0.84	0.77	0.77	2.26	2.19
Dividends declared per share (usd per share)	$ 0.50	$ 0.50	$ 0.50	$ 1.50	$ 1.5