Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
INTEREST INCOME:
Interest and fees on loans	$ 55,740	$ 49,105	$ 108,971	$ 95,851
Interest on investment securities:
Taxable	13,925	12,719	27,213	24,073
Exempt from federal income tax	9,244	9,983	19,007	20,324
Interest on federal funds sold and interest-bearing deposits in banks	667	271	1,286	912
Total interest income	79,576	72,078	156,477	141,160
INTEREST EXPENSE:
Interest on deposits	7,286	4,005	13,947	7,524
Other	675	462	1,401	576
Total interest expense	7,961	4,467	15,348	8,100
Net interest income	71,615	67,611	141,129	133,060
PROVISION FOR LOAN LOSSES	600	1,105	1,565	2,415
Net interest income after provision for loan losses	71,015	66,506	139,564	130,645
NONINTEREST INCOME:
Trust Fees	7,027	7,070	14,006	13,975
Service Charges on Deposit Accounts	5,374	5,375	10,550	10,259
ATM, interchange and credit card fees	7,352	7,041	14,192	14,037
Real estate mortgage operations	4,721	3,951	8,195	6,884
Net gain on sale of available-for-sale securities (includes $676 and $67 for the three months ended June 30, 2019 and 2018, respectively, and $676 and $1,288 for the six months ended June 30, 2019 and 2018, respectively, related to accumulated other comprehensive earnings reclassifications)	676	67	676	1,288
Net gain (loss) on sale of foreclosed assets	53	19	122	118
Net gain (loss) on sale of assets	6		6	(91)
Interest on loan recoveries	903	289	1,241	408
Other	1,864	1,676	3,425	3,034
Total noninterest income	27,976	25,488	52,413	49,912
NONINTEREST EXPENSE:
Salaries and employee benefits	27,394	26,862	53,918	53,065
Loss from partial settlement of pension plan			900
Net occupancy expense	2,779	2,806	5,542	5,689
Equipment expense	2,827	3,440	5,954	6,957
FDIC insurance premiums	538	632	1,076	1,199
ATM, interchange and credit card expenses	2,427	2,205	4,810	4,348
Professional and service fees	1,987	2,026	3,820	4,439
Printing, stationery and supplies	502	612	868	1,098
Operational and other losses	480	305	746	871
Software amortization and expense	1,287	479	2,210	1,003
Amortization of intangible assets	264	384	532	771
Other	7,819	7,393	15,297	15,503
Total noninterest expense	48,304	47,144	95,673	94,943
EARNINGS BEFORE INCOME TAXES	50,687	44,850	96,304	85,614
INCOME TAX EXPENSE (includes $142 and $14 for the three months ended June 30, 2019 and 2018, respectively, and $142 and $270 for the six months ended June 30, 2019 and 2018, respectively, related to income tax expense from reclassification items)	8,594	7,217	15,959	13,462
NET EARNINGS	$ 42,093	$ 37,633	$ 80,345	$ 72,152
EARNINGS PER SHARE, BASIC	$ 0.31	$ 0.28	$ 0.59	$ 0.53
EARNINGS PER SHARE, ASSUMING DILUTION	0.31	0.28	0.59	0.53
DIVIDENDS PER SHARE	$ 0.12	$ 0.11	$ 0.23	$ 0.20