ALLOWANCE FOR LOAN LOSSES: (Details 3) (Nonperforming Financing Receivable [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	$ 3,551	$ 2,157
Restructured	21,236	17,344
Nonaccrual	36,794	38,102
First Liens
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	1,237	1,150
Restructured	4,126	3,856
Nonaccrual	6,852	7,398
Home Equity
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	24	8
Nonaccrual	196
Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	538	154
Restructured		898
Nonaccrual	405	1,240
Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	133	77
Restructured	685
Nonaccrual	174	294
Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	724	317
Restructured	11,573	12,590
Nonaccrual	9,360	9,673
Farmland
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	231	74
Nonaccrual	907	979
Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	491	237
Restructured	4,836
Nonaccrual	6,718	12,542
Agriculture
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	69
Nonaccrual	104	225
All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Nonaccrual	4,811	3,171
Multifamily
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	101
Nonaccrual	5,598	668
All Other Residential
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing		136
Nonaccrual	150	171
All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	3	4
Restructured	16
Nonaccrual	$ 1,519	$ 1,741