Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
INTEREST INCOME:
Interest and fees on loans	$ 42,749	$ 40,411	$ 123,643	$ 120,700
Interest on investment securities:
Taxable	8,074	6,775	23,848	21,167
Exempt from federal income tax	11,091	10,808	33,991	32,220
Interest on federal funds sold and interest-bearing deposits in banks	640	99	1,037	222
Total interest income	62,554	58,093	182,519	174,309
INTEREST EXPENSE:
Interest on deposits	2,228	1,112	5,748	3,197
Other	638	254	978	811
Total interest expense	2,866	1,366	6,726	4,008
Net interest income	59,688	56,727	175,793	170,301
PROVISION FOR LOAN LOSSES	1,415	3,833	5,090	8,219
Net interest income after provision for loan losses	58,273	52,894	170,703	162,082
NONINTEREST INCOME:
Trust fees	6,040	5,066	17,804	14,446
Service charges on deposit accounts	5,083	4,796	14,517	13,614
ATM, interchange and credit card fees	6,340	6,000	19,102	17,521
Real estate mortgage operations	3,891	4,697	11,496	11,849
Net gain on sale of available-for-sale securities (includes $1,075 and $239 for the three months ended September 30, 2017 and 2016, respectively, and $1,825 and $1,153 for the nine months ended September 30, 2017 and 2016, respectively, related to accumulated other comprehensive earnings reclassifications)	1,075	239	1,825	1,153
Net gain (loss) on sale of foreclosed assets	(11)	(10)	(42)	343
Net gain (loss) on sale of assets	(15)	(168)	(211)	271
Interest on loan recoveries	405	709	896	1,970
Other	1,452	823	3,328	2,243
Total noninterest income	24,260	22,152	68,715	63,410
NONINTEREST EXPENSE:
Salaries and employee benefits	24,143	22,931	70,867	67,668
Net occupancy expense	2,711	2,672	8,081	7,886
Equipment expense	3,294	3,420	10,397	10,186
FDIC insurance premiums	561	513	1,657	2,155
ATM, interchange and credit card expenses	2,001	1,859	5,517	5,352
Professional and service fees	2,036	1,883	5,878	5,099
Printing, stationery and supplies	449	536	1,423	1,504
Operational and other losses	1,081	533	2,639	1,452
Amortization of intangible assets	143	172	477	570
Other	7,545	7,484	22,955	21,968
Total noninterest expense	43,964	42,003	129,891	123,840
EARNINGS BEFORE INCOME TAXES	38,569	33,043	109,527	101,652
INCOME TAX EXPENSE (includes $376 and $84 for the three months ended September 30, 2017 and 2016, respectively, and $639 and $404 for the nine months ended September 30, 2017 and 2016, respectively, related to income tax expense from reclassification items)	9,195	7,440	25,300	23,544
NET EARNINGS	$ 29,374	$ 25,603	$ 84,227	$ 78,108
EARNINGS PER SHARE, BASIC	$ 0.44	$ 0.39	$ 1.27	$ 1.18
EARNINGS PER SHARE, ASSUMING DILUTION	0.44	0.39	1.27	1.18
DIVIDENDS PER SHARE	$ 0.19	$ 0.18	$ 0.56	$ 0.52