Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
INTEREST INCOME:
Interest and fees on loans	$ 41,311	$ 39,942	$ 80,894	$ 80,289
Interest on investment securities:
Taxable	8,343	7,130	15,774	14,392
Exempt from federal income tax	11,408	10,745	22,900	21,411
Interest on federal funds sold and interest-bearing deposits in banks	120	64	397	124
Total interest income	61,182	57,881	119,965	116,216
INTEREST EXPENSE:
Interest on deposits	1,930	1,033	3,520	2,086
Other	167	297	340	556
Total interest expense	2,097	1,330	3,860	2,642
Net interest income	59,085	56,551	116,105	113,574
PROVISION FOR LOAN LOSSES	1,725	2,058	3,675	4,386
Net interest income after provision for loan losses	57,360	54,493	112,430	109,188
NONINTEREST INCOME:
Trust fees	5,747	4,726	11,764	9,380
Service charges on deposit accounts	4,883	4,404	9,433	8,818
ATM, interchange and credit card fees	6,598	5,840	12,762	11,521
Real estate mortgage operations	4,188	4,013	7,605	7,153
Net gain on sale of available-for-sale securities (includes $747 and $912 for the three months ended June 30, 2017 and 2016, respectively, and $750 and $914 for the six months ended June 30, 2017 and 2016, respectively, related to accumulated other comprehensive earnings reclassifications)	747	912	750	914
Net gain (loss) on sale of foreclosed assets	(72)	278	(31)	353
Net gain (loss) on sale of assets	(200)	(74)	(196)	439
Interest on loan recoveries	337	629	491	1,261
Other	942	710	1,877	1,419
Total noninterest income	23,170	21,438	44,455	41,258
NONINTEREST EXPENSE:
Salaries and employee benefits	23,465	22,147	46,724	44,737
Net occupancy expense	2,771	2,583	5,370	5,214
Equipment expense	3,665	3,386	7,102	6,766
FDIC insurance premiums	550	818	1,097	1,642
ATM, interchange and credit card expenses	1,803	1,806	3,516	3,492
Professional and service fees	2,025	1,650	3,842	3,215
Printing, stationery and supplies	536	464	974	967
Operational and other losses	574	433	1,559	920
Amortization of intangible assets	165	199	333	398
Other	8,221	7,270	15,409	14,485
Total noninterest expense	43,775	40,756	85,926	81,836
EARNINGS BEFORE INCOME TAXES	36,755	35,175	70,959	68,610
INCOME TAX EXPENSE (includes $261 and $319 for the three months ended June 30, 2017 and 2016, respectively, and $263 and $320 for the six months ended June 30, 2017 and 2016, respectively, related to income tax expense from reclassification items)	8,500	8,366	16,105	16,105
NET EARNINGS	$ 28,255	$ 26,809	$ 54,854	$ 52,505
EARNINGS PER SHARE, BASIC	$ 0.43	$ 0.41	$ 0.83	$ 0.80
EARNINGS PER SHARE, ASSUMING DILUTION	0.43	0.41	0.83	0.79
DIVIDENDS PER SHARE	$ 0.19	$ 0.18	$ 0.37	$ 0.34