Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
INTEREST INCOME:
Interest and fees on loans	$ 40,347	$ 35,061
Interest on investment securities:
Taxable	7,262	7,808
Exempt from federal income tax	10,666	9,120
Interest on federal funds sold and interest-bearing deposits in banks	60	80
Total interest income	58,335	52,069
INTEREST EXPENSE:
Interest on deposits	1,053	928
Other	259	42
Total interest expense	1,312	970
Net interest income	57,023	51,099
PROVISION FOR LOAN LOSSES	2,328	1,290
Net interest income after provision for loan losses	54,695	49,809
NONINTEREST INCOME:
Trust fees	4,655	4,731
Service charges on deposit accounts	4,413	3,768
ATM, interchange and credit card fees	5,680	4,969
Real estate mortgage operations	3,139	1,482
Net gain on sale of available-for-sale securities (includes $2 and $5 for the three months ended March 31, 2016 and 2015, respectively, related to accumulated other comprehensive earnings reclassifications)	2	5
Net gain on sale of foreclosed assets	76	30
Net gain on sale of assets	513	5
Interest on loan recoveries	633	108
Other	710	799
Total noninterest income	19,821	15,897
NONINTEREST EXPENSE:
Salaries and employee benefits	22,590	18,265
Net occupancy expense	2,631	2,197
Equipment expense	3,380	2,899
FDIC insurance premiums	824	748
ATM, interchange and credit card expenses	1,687	1,725
Professional and service fees	1,564	1,065
Printing, stationery and supplies	503	596
Amortization of intangible assets	199	90
Other	7,703	6,358
Total noninterest expense	41,081	33,943
EARNINGS BEFORE INCOME TAXES	33,435	31,763
INCOME TAX EXPENSE (includes $1 and $2 for the three months ended March 31, 2016 and 2015, respectively, related to income tax expense reclassification)	7,739	7,766
NET EARNINGS	$ 25,696	$ 23,997
EARNINGS PER SHARE, BASIC	$ 0.39	$ 0.37
EARNINGS PER SHARE, ASSUMING DILUTION	0.39	0.37
DIVIDENDS PER SHARE	$ 0.16	$ 0.14