Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
INTEREST INCOME:
Interest and fees on loans	$ 114,612	$ 107,622	$ 98,627
Interest and dividends on investment securities:
Taxable securities	11,713	12,487	14,810
Nontaxable securities	730	609	271
Dividends on securities	561	432	507
Interest on federal funds sold and other	166	116	102
Total interest income	127,782	121,266	114,317
INTEREST EXPENSE:
Interest on deposits	3,854	3,640	3,866
Interest on short-term borrowings and securities sold under agreements to repurchase	494	214	441
Interest on subordinated debentures and notes payable	7,383	5,736	4,122
Total interest expense	11,731	9,590	8,429
NET INTEREST INCOME BEFORE PROVISION FOR LOAN LOSSES	116,051	111,676	105,888
Provision for loan losses	(2,101)	6,420	(4,155)
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	118,152	105,256	110,043
NONINTEREST INCOME:
Service charges	6,059	5,862	5,598
Investment advisory income	5,714	5,832	5,736
Insurance income	12,568	12,047	11,150
Other income	9,819	6,926	5,425
Total noninterest income	34,160	30,667	27,909
NONINTEREST EXPENSE:
Salaries and employee benefits	71,471	69,526	66,008
Occupancy expenses, premises and equipment	14,966	13,079	13,100
Amortization of intangibles	600	600	597
FDIC and other assessments	1,692	1,813	1,737
Other real estate owned and loan workout costs	512	388	1,066
Net gain on securities, other assets and other real estate owned	(121)	(369)	(2,597)
Other expense	16,111	15,140	14,225
Total noninterest expense	105,231	100,177	94,136
INCOME BEFORE INCOME TAXES	47,081	35,746	43,816
Provision for income taxes	12,182	9,606	15,018
NET INCOME FROM CONTINUING OPERATIONS	34,899	26,140	28,798
DISCONTINUED OPERATIONS:
Income (loss) from discontinued operations		(113)	338
Provision (benefit) for income taxes		(42)	129
Net income (loss) from discontinued operations		(71)	209
NET INCOME	34,899	26,069	29,007
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 34,899	$ 25,749	$ 28,433
EARNINGS PER COMMON SHARE:
Basic - Continuing	$ 0.84	$ 0.63	$ 0.69
Diluted - Continuing	0.84	0.62	0.69
Basic - Discontinued		0.00	0.01
Diluted - Discontinued		0.00	0.01
Basic	0.84	0.63	0.70
Diluted	$ 0.84	$ 0.62	$ 0.70