Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Aging of recorded investment in loans by past due category and class of loans
Non-accrual Troubled Debt Restructurings	$ 1,700	$ 1,600
Impaired loans	34,664	32,626
Allowance for impaired loans	5,680	4,273
Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	3,970	2,157
Non-accrual Troubled Debt Restructurings	21,338	17,344
Nonaccrual	41,913	38,102
Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Allowance for impaired loans	3,925	2,664
Commercial & Industrial | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	1,303	317
Non-accrual Troubled Debt Restructurings	11,842	12,590
Nonaccrual	11,231	9,673
Farmland
Aging of recorded investment in loans by past due category and class of loans
Allowance for impaired loans	49	49
Farmland | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	433	74
Nonaccrual	908	979
Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Allowance for impaired loans	182	957
Non Farm, Non Residential | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	960	237
Non-accrual Troubled Debt Restructurings	4,937
Nonaccrual	6,725	12,542
Agriculture | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	4
Nonaccrual	115	225
All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Allowance for impaired loans	56	66
All Other Commercial | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Nonaccrual	5,581	3,171
First Liens
Aging of recorded investment in loans by past due category and class of loans
Allowance for impaired loans	190	190
First Liens | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	836	1,150
Non-accrual Troubled Debt Restructurings	3,866	3,856
Nonaccrual	7,352	7,398
Home Equity | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	19	8
Nonaccrual	214
Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Allowance for impaired loans		347
Junior Liens | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	303	154
Non-accrual Troubled Debt Restructurings		898
Nonaccrual	420	1,240
Multifamily
Aging of recorded investment in loans by past due category and class of loans
Allowance for impaired loans	1,278
Multifamily | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Nonaccrual	7,501	668
All Other Residential | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing		136
Nonaccrual	155	171
Motor Vehicle | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	106	77
Non-accrual Troubled Debt Restructurings	676
Nonaccrual	177	294
All Other Consumer | Non performing loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	6	4
Non-accrual Troubled Debt Restructurings	17
Nonaccrual	1,534	1,741
Covered Loans
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	712	413
Nonaccrual	4,300	5,600
Impaired loans	3,000	5,000
Allowance for impaired loans	$ 129	$ 1,000