LOANS AND LEASES (Class and Credit Indicator) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	$ 4,075,873	$ 3,768,106
Net deferred costs (income)	2,493	2,509
Total loans and leases	4,078,366	3,770,615
Pass
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	4,032,344	3,703,685
Special Mention
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	18,373	29,157
Substandard
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	24,998	34,993
Loss
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	158	271
Commercial, financial and agricultural
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	581,177	503,738
Net deferred costs (income)	483	281
Total loans and leases	581,660	504,019
Commercial, financial and agricultural | Pass
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	552,706	474,995
Commercial, financial and agricultural | Special Mention
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	7,961	7,543
Commercial, financial and agricultural | Substandard
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	20,510	21,200
Commercial, financial and agricultural | Loss
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Real estate | Construction
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	67,269	64,525
Net deferred costs (income)	(342)	(285)
Total loans and leases	66,927	64,240
Real estate | Construction | Pass
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	67,269	55,646
Real estate | Construction | Special Mention
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	8,879
Real estate | Construction | Substandard
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Real estate | Construction | Loss
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Real estate | Residential mortgage
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	1,424,384	1,337,193
Net deferred costs (income)	3,821	4,028
Total loans and leases	1,428,205	1,341,221
Real estate | Residential mortgage | Pass
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	1,422,240	1,334,760
Real estate | Residential mortgage | Special Mention
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Real estate | Residential mortgage | Substandard
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	2,144	2,433
Real estate | Residential mortgage | Loss
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Real estate | Home equity
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	468,966	412,230
Net deferred costs (income)	0	0
Total loans and leases	468,966	412,230
Real estate | Home equity | Pass
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	468,394	411,814
Real estate | Home equity | Special Mention
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Real estate | Home equity | Substandard
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	572	416
Real estate | Home equity | Loss
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Real estate | Commercial mortgage
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	1,041,685	979,239
Net deferred costs (income)	(1,407)	(1,442)
Total loans and leases	1,040,278	977,797
Real estate | Commercial mortgage | Pass
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	1,029,581	955,865
Real estate | Commercial mortgage | Special Mention
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	10,412	12,735
Real estate | Commercial mortgage | Substandard
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	1,692	10,639
Real estate | Commercial mortgage | Loss
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Consumer | Other
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	492,268	470,819
Net deferred costs (income)	(62)	(73)
Total loans and leases	492,206	470,746
Consumer | Other | Pass
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	492,030	470,243
Consumer | Other | Special Mention
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Consumer | Other | Substandard
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	80	305
Consumer | Other | Loss
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	158	271
Leases
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	124	362
Net deferred costs (income)	0	0
Total loans and leases	124	362
Leases | Pass
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	124	362
Leases | Special Mention
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Leases | Substandard
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	0	0
Leases | Loss
Recorded investment in the loans and leases, by class and credit indicator
Loans and leases, gross	$ 0	$ 0