Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
INTEREST INCOME:
Interest and fees on loans	$ 39,584	$ 40,347
Interest on investment securities:
Taxable	7,431	7,262
Exempt from federal income tax	11,492	10,666
Interest on federal funds sold and interest-bearing deposits in banks	276	60
Total interest income	58,783	58,335
INTEREST EXPENSE:
Interest on deposits	1,590	1,053
Other	173	259
Total interest expense	1,763	1,312
Net interest income	57,020	57,023
PROVISION FOR LOAN LOSSES	1,950	2,328
Net interest income after provision for loan losses	55,070	54,695
NONINTEREST INCOME:
Trust fees	6,017	4,655
Service charges on deposit accounts	4,550	4,413
ATM, interchange and credit card fees	6,164	5,680
Real estate mortgage operations	3,417	3,139
Net gain on sale of available-for-sale securities (includes $3 and $2 for the three months ended March 31, 2017 and 2016, respectively, related to accumulated other comprehensive earnings reclassifications)	3	2
Net gain on sale of foreclosed assets	41	76
Net gain on sale of assets	4	513
Interest on loan recoveries	154	633
Other	936	710
Total noninterest income	21,286	19,821
NONINTEREST EXPENSE:
Salaries and employee benefits	23,259	22,590
Net occupancy expense	2,600	2,631
Equipment expense	3,437	3,380
FDIC insurance premiums	547	824
ATM, interchange and credit card expenses	1,713	1,687
Professional and service fees	1,817	1,564
Printing, stationery and supplies	438	503
Amortization of intangible assets	168	199
Operational and other losses	985	486
Other	7,188	7,217
Total noninterest expense	42,152	41,081
EARNINGS BEFORE INCOME TAXES	34,204	33,435
INCOME TAX EXPENSE (includes $1 and $1 for the three months ended March 31, 2017 and 2016, respectively, related to income tax expense reclassification)	7,605	7,739
NET EARNINGS	$ 26,599	$ 25,696
EARNINGS PER SHARE, BASIC	$ 0.40	$ 0.39
EARNINGS PER SHARE, ASSUMING DILUTION	0.40	0.39
DIVIDENDS PER SHARE	$ 0.18	$ 0.16