ALLOWANCE FOR LOAN LOSSES: (Details 5) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	$ 25,726	$ 31,590
Current	2,592,827	2,634,852
BALANCE AT END OF YEAR	2,618,553	2,666,442
Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	4,795	5,030
Current	603,777	594,925
BALANCE AT END OF YEAR	608,572	599,955
Farmland
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	113	2,221
Current	118,528	137,730
BALANCE AT END OF YEAR	118,641	139,951
Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	426	3,853
Current	350,681	398,854
BALANCE AT END OF YEAR	351,107	402,707
Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	333	405
Current	146,147	162,794
BALANCE AT END OF YEAR	146,480	163,199
All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	24	109
Current	305,612	288,845
BALANCE AT END OF YEAR	305,636	288,954
First Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	9,737	9,202
Current	314,730	375,924
BALANCE AT END OF YEAR	324,467	385,126
Home Equity
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	393	221
Current	60,362	70,813
BALANCE AT END OF YEAR	60,755	71,034
Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	830	564
Current	53,346	54,533
BALANCE AT END OF YEAR	54,176	55,097
Multifamily
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	0	0
Current	151,042	148,282
BALANCE AT END OF YEAR	151,042	148,282
All Other Residential
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	50	1,972
Current	15,918	22,510
BALANCE AT END OF YEAR	15,968	24,482
Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	8,829	7,741
Current	441,283	347,950
BALANCE AT END OF YEAR	450,112	355,691
All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	196	272
Current	31,401	31,692
BALANCE AT END OF YEAR	31,597	31,964
30 to 59 Days Past Due
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	14,216	21,801
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	685	2,885
30 to 59 Days Past Due | Farmland
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	22	132
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	155	3,749
30 to 59 Days Past Due | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	28	277
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	0	0
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	5,506	6,452
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	260	124
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	421	384
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	0	1,082
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	6,975	6,488
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	164	228
60 to 89 Days Past Due
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	4,102	3,421
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	746	766
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	0	104
60 to 89 Days Past Due | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	30	128
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	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	1,866	1,292
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	29	63
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	68	43
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	50	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	1,294	983
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	19	42
Greater than 90 Days Past Due
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	7,408	6,368
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	3,364	1,379
Greater than 90 Days Past Due | Farmland
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	91	2,089
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	271	0
Greater than 90 Days Past Due | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Total Past Due	275	0
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	24	109
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	2,365	1,458
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	104	34
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	341	137
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	890
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	560	270
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	$ 13	$ 2