ALLOWANCE FOR LOAN LOSSES: (Details 5) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	$ 15,501	$ 17,296
Current	1,829,539	1,752,494
BALANCE AT END OF YEAR	1,845,040	1,769,790
Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	1,683	2,005
Current	474,406	476,984
BALANCE AT END OF YEAR	476,089	478,989
Farmland
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	303	135
Current	110,897	106,725
BALANCE AT END OF YEAR	111,200	106,860
Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	368	2,224
Current	195,120	206,844
BALANCE AT END OF YEAR	195,488	209,068
Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	713	427
Current	151,059	143,116
BALANCE AT END OF YEAR	151,772	143,543
All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	15	57
Current	178,171	111,484
BALANCE AT END OF YEAR	178,186	111,541
First Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	6,332	7,812
Current	264,446	285,913
BALANCE AT END OF YEAR	270,778	293,725
Home Equity
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	277	222
Current	35,782	37,502
BALANCE AT END OF YEAR	36,059	37,724
Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	495	385
Current	36,912	32,876
BALANCE AT END OF YEAR	37,407	33,261
Multifamily
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	0
Current	67,799	70,735
BALANCE AT END OF YEAR	67,799	70,735
All Other Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	54	15
Current	12,982	10,195
BALANCE AT END OF YEAR	13,036	10,210
Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	5,093	3,961
Current	277,604	247,882
BALANCE AT END OF YEAR	282,697	251,843
All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	168	53
Current	24,361	22,238
BALANCE AT END OF YEAR	24,529	22,291
30 to 59 Days Past Due
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	9,571	10,864
30 to 59 Days Past Due | Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	370	326
30 to 59 Days Past Due | Farmland
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	235	135
30 to 59 Days Past Due | Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	153	1,824
30 to 59 Days Past Due | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	246	65
30 to 59 Days Past Due | All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	15	25
30 to 59 Days Past Due | First Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	3,862	4,960
30 to 59 Days Past Due | Home Equity
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	186	85
30 to 59 Days Past Due | Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	271	179
30 to 59 Days Past Due | Multifamily
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	0
30 to 59 Days Past Due | All Other Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	42	15
30 to 59 Days Past Due | Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	4,048	3,212
30 to 59 Days Past Due | All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	143	38
60 to 89 Days Past Due
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	1,920	2,245
60 to 89 Days Past Due | Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	114	274
60 to 89 Days Past Due | Farmland
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	22	0
60 to 89 Days Past Due | Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	90
60 to 89 Days Past Due | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	38
60 to 89 Days Past Due | All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	32
60 to 89 Days Past Due | First Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	954	1,181
60 to 89 Days Past Due | Home Equity
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	64	23
60 to 89 Days Past Due | Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	29
60 to 89 Days Past Due | Multifamily
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	0
60 to 89 Days Past Due | All Other Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	12	0
60 to 89 Days Past Due | Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	732	568
60 to 89 Days Past Due | All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	22	10
Greater than 90 Days Past Due
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	4,010	4,187
Greater than 90 Days Past Due | Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	1,199	1,405
Greater than 90 Days Past Due | Farmland
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	46	0
Greater than 90 Days Past Due | Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	215	310
Greater than 90 Days Past Due | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	467	324
Greater than 90 Days Past Due | All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	0
Greater than 90 Days Past Due | First Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	1,516	1,671
Greater than 90 Days Past Due | Home Equity
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	27	114
Greater than 90 Days Past Due | Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	224	177
Greater than 90 Days Past Due | Multifamily
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	0
Greater than 90 Days Past Due | All Other Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	0
Greater than 90 Days Past Due | Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	313	181
Greater than 90 Days Past Due | All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	$ 3	$ 5