Consolidated Statements of Earnings (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
INTEREST INCOME:
Interest and fees on loans	$ 33,846	$ 28,950	$ 66,904	$ 55,396
Interest on investment securities:
Taxable	7,091	6,313	14,175	12,688
Exempt from federal income tax	8,228	7,063	16,208	13,642
Interest on federal funds sold and interest-bearing deposits in banks	89	120	176	296
Total interest income	49,254	42,446	97,463	82,022
INTEREST EXPENSE:
Interest on deposits	955	853	1,895	1,721
Other	82	93	178	130
Total interest expense	1,037	946	2,073	1,851
Net interest income	48,217	41,500	95,390	80,171
PROVISION FOR LOAN LOSSES	1,124	832	2,814	1,233
Net interest income after provision for loan losses	47,093	40,668	92,576	78,938
NONINTEREST INCOME:
Trust fees	4,549	3,953	9,125	7,746
Service charges on deposit accounts	4,174	4,316	8,221	8,211
ATM, interchange and credit card fees	4,754	4,181	9,197	7,910
Real estate mortgage operations	1,337	1,686	2,361	3,069
Net gain (loss) on sale of available-for-sale securities (includes $(1) and $33 for the three months ended June 30, 2014 and 2013, respectively, and $(5) and $255 for the six months ended June 30, 2014 and 2013, respectively, related to accumulated other comprehensive earnings reclassifications)	(1)	33	(5)	255
Net gain (loss) on sale of foreclosed assets	47	17	499	(299)
Other	1,012	967	2,879	2,221
Total noninterest income	15,872	15,153	32,277	29,113
NONINTEREST EXPENSE:
Salaries and employee benefits	17,274	16,151	34,688	31,331
Net occupancy expense	2,273	2,064	4,507	3,831
Equipment expense	2,665	2,380	5,287	4,661
FDIC insurance premiums	684	568	1,343	1,141
ATM, interchange and credit card expenses	1,696	1,347	3,176	2,687
Professional and service fees	963	1,027	2,044	1,830
Printing, stationery and supplies	554	498	1,329	970
Amortization of intangible assets	74	33	148	43
Other	8,819	5,843	14,927	10,888
Total noninterest expense	35,002	29,911	67,449	57,382
EARNINGS BEFORE INCOME TAXES	27,963	25,910	57,404	50,669
INCOME TAX EXPENSE (includes $0 and $12 for the three months ended June 30, 2014 and 2013, respectively, and $(2) and $89 for the six months ended June 30, 2014 and 2013, respectively, related to income tax expense from reclassification items)	6,758	6,420	13,863	12,602
NET EARNINGS	$ 21,205	$ 19,490	$ 43,541	$ 38,067
EARNINGS PER SHARE, BASIC	$ 0.33	$ 0.31	$ 0.68	$ 0.60
EARNINGS PER SHARE, ASSUMING DILUTION	$ 0.33	$ 0.31	$ 0.68	$ 0.60
DIVIDENDS PER SHARE	$ 0.14	$ 0.13	$ 0.27	$ 0.26