ALLOWANCE FOR LOAN LOSSES: (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	$ 11,705	$ 21,884
60-89 Days Past Due	2,858	4,532
Greater than 90 days Past Due	12,977	18,650
Total Past Due	27,540	45,066
Current	1,773,282	1,816,866
BALANCE AT END OF YEAR	1,800,822	1,861,932
Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	1,076	1,315
60-89 Days Past Due	266	861
Greater than 90 days Past Due	7,900	3,616
Total Past Due	9,242	5,792
Current	459,076	487,160
BALANCE AT END OF YEAR	468,318	492,952
Farmland
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	0	534
60-89 Days Past Due	0	0
Greater than 90 days Past Due	0	1,122
Total Past Due	0	1,656
Current	92,602	87,270
BALANCE AT END OF YEAR	92,602	88,926
Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	362	5,618
60-89 Days Past Due	0	1,004
Greater than 90 days Past Due	2,042	2,449
Total Past Due	2,404	9,071
Current	239,183	290,023
BALANCE AT END OF YEAR	241,587	299,094
Agriculture
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	31	137
60-89 Days Past Due	32	0
Greater than 90 days Past Due	0	78
Total Past Due	63	215
Current	136,388	130,404
BALANCE AT END OF YEAR	136,451	130,619
All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	50	568
60-89 Days Past Due	217	202
Greater than 90 days Past Due	188	350
Total Past Due	455	1,120
Current	108,184	81,453
BALANCE AT END OF YEAR	108,639	82,573
First Liens
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	5,594	8,359
60-89 Days Past Due	1,513	1,659
Greater than 90 days Past Due	1,701	4,599
Total Past Due	8,808	14,617
Current	324,141	336,230
BALANCE AT END OF YEAR	332,949	350,847
Home Equity
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	307	143
60-89 Days Past Due	7	15
Greater than 90 days Past Due	40	24
Total Past Due	354	182
Current	41,350	43,317
BALANCE AT END OF YEAR	41,704	43,499
Junior Liens
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	392	555
60-89 Days Past Due	170	98
Greater than 90 days Past Due	471	586
Total Past Due	1,033	1,239
Current	32,269	36,535
BALANCE AT END OF YEAR	33,302	37,774
Multifamily
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	103	52
60-89 Days Past Due	19	0
Greater than 90 days Past Due	400	5,641
Total Past Due	522	5,693
Current	66,138	49,019
BALANCE AT END OF YEAR	66,660	54,712
All Other Residential
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	88	214
60-89 Days Past Due	0	0
Greater than 90 days Past Due	1
Total Past Due	89	214
Current	9,169	10,834
BALANCE AT END OF YEAR	9,258	11,048
Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	3,579	4,164
60-89 Days Past Due	612	600
Greater than 90 days Past Due	227	182
Total Past Due	4,418	4,946
Current	243,146	241,303
BALANCE AT END OF YEAR	247,564	246,249
All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
30-59 Days Past Due	123	225
60-89 Days Past Due	22	93
Greater than 90 days Past Due	7	3
Total Past Due	152	321
Current	21,636	23,318
BALANCE AT END OF YEAR	$ 21,788	$ 23,639