Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Interest income:
Loans and leases	$ 274,229	$ 272,522	$ 251,085
Investment securities	29,680	29,690	26,138
Deposits in financial institutions	650	527	552
Total interest income	304,559	302,739	277,775
Interest expense:
Deposits	34,235	28,834	13,818
Borrowings	7,710	4,602	920
Subordinated debentures	7,738	7,538	6,537
Total interest expense	49,683	40,974	21,275
Net interest income	254,876	261,765	256,500
Provision for credit losses	4,000	12,000	4,000
Net interest income after provision for credit losses	250,876	249,765	252,500
Noninterest income:
Other commissions and fees	11,008	11,114	10,265
Leased equipment income	9,282	9,384	9,587
Service charges on deposit accounts	3,730	4,091	4,174
Gain on sale of loans and leases	0	0	4,569
Gain on sale of securities	2,161	786	6,311
Other income	4,883	8,151	3,653
Total noninterest income	31,064	33,526	38,559
Noninterest expense:
Compensation	70,845	69,299	71,023
Occupancy	14,320	13,356	13,223
Data processing	6,925	6,930	6,659
Leased equipment depreciation	5,651	5,758	5,375
Intangible asset amortization	4,870	4,986	6,346
Other professional services	4,513	6,198	4,439
Insurance and assessments	4,038	4,202	5,727
Loan expense	2,885	2,991	2,271
Acquisition, integration and reorganization costs	618	970	0
Foreclosed assets expense (income), net	29	(311)	(122)
Other expense	11,593	14,856	12,454
Total noninterest expense	126,287	129,235	127,395
Earnings before income taxes	155,653	154,056	163,664
Income tax expense	(43,049)	(39,015)	(45,388)
Net earnings	$ 112,604	$ 115,041	$ 118,276
Earnings per share:
Net earnings (usd per share)	$ 0.92	$ 0.93	$ 0.93
Net earnings (usd per share)	$ 0.92	$ 0.93	$ 0.93