ALLOWANCE FOR LOAN LOSSES: (Details 5) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	$ 17,296	$ 20,409
Current	1,752,494	1,768,416
BALANCE AT END OF YEAR	1,769,790	1,788,825
Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	2,005	4,036
Current	476,984	451,549
BALANCE AT END OF YEAR	478,989	455,585
Farmland
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	135	0
Current	106,725	95,452
BALANCE AT END OF YEAR	106,860	95,452
Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	2,224	1,798
Current	206,844	232,440
BALANCE AT END OF YEAR	209,068	234,238
Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	427	766
Current	143,116	149,099
BALANCE AT END OF YEAR	143,543	149,865
All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	57	255
Current	111,484	115,014
BALANCE AT END OF YEAR	111,541	115,269
First Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	7,812	8,496
Current	285,913	308,068
BALANCE AT END OF YEAR	293,725	316,564
Home Equity
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	222	484
Current	37,502	40,043
BALANCE AT END OF YEAR	37,724	40,527
Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	385	570
Current	32,876	31,487
BALANCE AT END OF YEAR	33,261	32,057
Multifamily
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	0
Current	70,735	72,310
BALANCE AT END OF YEAR	70,735	72,310
All Other Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	15	117
Current	10,195	8,961
BALANCE AT END OF YEAR	10,210	9,078
Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	3,961	3,763
Current	247,882	242,406
BALANCE AT END OF YEAR	251,843	246,169
All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	53	124
Current	22,238	21,587
BALANCE AT END OF YEAR	22,291	21,711
30 to 59 Days Past Due
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	10,864	12,277
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	326	574
30 to 59 Days Past Due | Farmland
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	135	0
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	1,824	1,528
30 to 59 Days Past Due | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	65	246
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	25	255
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	4,960	6,011
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	85	141
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	179	270
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	15	112
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	3,212	3,026
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	38	114
60 to 89 Days Past Due
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	2,245	2,145
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	274	416
60 to 89 Days Past Due | Farmland
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 | Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	90	68
60 to 89 Days Past Due | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	38	18
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	32	0
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	1,181	963
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	23	33
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	29	83
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	0	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	568	557
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	10	7
Greater than 90 Days Past Due
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	4,187	5,987
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	1,405	3,046
Greater than 90 Days Past Due | Farmland
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 | Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	310	202
Greater than 90 Days Past Due | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	324	502
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	1,671	1,522
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	114	310
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	177	217
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	5
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	181	180
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	$ 5	$ 3