Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
INTEREST INCOME:
Loans, including fees	$ 133,525	$ 128,445	$ 263,590	$ 244,691
Securities	53,944	55,577	109,592	110,034
Federal funds sold and other earning assets	318	299	720	614
Total interest income	187,787	184,321	373,902	355,339
INTEREST EXPENSE:
Deposits	26,562	16,061	51,690	30,533
Other borrowings	5,556	6,046	10,873	9,019
Securities sold under repurchase agreements	831	411	1,590	761
Total interest expense	32,949	22,518	64,153	40,313
NET INTEREST INCOME	154,838	161,803	309,749	315,026
PROVISION FOR CREDIT LOSSES	800	4,000	1,500	13,000
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	154,038	157,803	308,249	302,026
NONINTEREST INCOME:
Nonsufficient funds (NSF) fees	7,973	7,828	15,789	15,655
Credit card, debit card and ATM card income	6,480	6,335	12,451	12,296
Service charges on deposit accounts	4,989	5,150	9,987	10,425
Trust income	2,558	2,251	5,153	4,979
Mortgage income	990	1,109	1,712	1,872
Brokerage income	541	687	1,214	1,312
Gain (loss) on sale of assets	2	(44)	60	(44)
Net loss on sale of securities	0	(13)	0	(13)
Other	6,425	5,068	11,736	9,827
Total noninterest income	29,958	28,371	58,102	56,309
NONINTEREST EXPENSE:
Salaries and employee benefits	52,941	53,360	104,014	103,759
Net occupancy and equipment	5,492	5,692	10,958	11,301
Credit and debit card, data processing and software amortization	4,904	4,356	9,477	8,804
Regulatory assessments and FDIC insurance	2,325	3,575	4,699	7,150
Core deposit intangibles amortization	1,265	1,501	2,584	3,069
Depreciation	3,111	3,054	6,215	6,087
Communications	2,183	2,606	4,453	5,186
Other real estate expense, net	66	93	(28)	304
Other	8,534	9,365	17,020	17,996
Total noninterest expense	80,821	83,602	159,392	163,656
INCOME BEFORE INCOME TAXES	103,175	102,572	206,959	194,679
PROVISION FOR INCOME TAXES	20,917	20,975	42,299	38,721
NET INCOME	$ 82,258	$ 81,597	$ 164,660	$ 155,958
EARNINGS PER SHARE:
Basic	$ 1.18	$ 1.17	$ 2.36	$ 2.23
Diluted	$ 1.18	$ 1.17	$ 2.36	$ 2.23