Loans, Part III (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 22,834	$ 33,355
Recorded Investment With No Allowance	13,452	18,100
Recorded Investment With Allowance	8,479	13,781
Total Recorded Investment	21,931	31,881
Related Allowance	658	1,254
Average recorded investment	27,039	41,930
Commercial and Business Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	1,488	6,521
Recorded Investment With No Allowance	767	4,002
Recorded Investment With Allowance	576	2,425
Total Recorded Investment	1,343	6,427
Related Allowance	37	112
Average recorded investment	5,468	11,102
Government Program Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	109	704
Recorded Investment With No Allowance	88	212
Recorded Investment With Allowance	0	0
Total Recorded Investment	88	212
Related Allowance	0	0
Average recorded investment	147	301
Total Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	1,597	7,225
Recorded Investment With No Allowance	855	4,214
Recorded Investment With Allowance	576	2,425
Total Recorded Investment	1,431	6,639
Related Allowance	37	112
Average recorded investment	5,615	11,403
Commercial Real Estate Term Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	11,393	6,838
Recorded Investment With No Allowance	6,818	2,951
Recorded Investment With Allowance	4,237	3,736
Total Recorded Investment	11,055	6,687
Related Allowance	436	489
Average recorded investment	8,498	6,935
Residential Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	7,461	5,136
Recorded Investment With No Allowance	3,726	1,708
Recorded Investment With Allowance	3,666	3,395
Total Recorded Investment	7,392	5,103
Related Allowance	185	200
Average recorded investment	4,416	3,934
Home Improvement and Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	10	36
Recorded Investment With No Allowance	10	22
Recorded Investment With Allowance	0	15
Total Recorded Investment	10	37
Related Allowance	0	1
Average recorded investment	21	96
Total Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	18,864	12,010
Recorded Investment With No Allowance	10,554	4,681
Recorded Investment With Allowance	7,903	7,146
Total Recorded Investment	18,457	11,827
Related Allowance	621	690
Average recorded investment	12,935	10,965
Total RE Construction and Development Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	1,730	11,535
Recorded Investment With No Allowance	1,730	9,014
Recorded Investment With Allowance	0	2,418
Total Recorded Investment	1,730	11,432
Related Allowance	0	71
Average recorded investment	7,298	17,184
Total Agricultural Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	504	2,445
Recorded Investment With No Allowance	192	61
Recorded Investment With Allowance	0	1,792
Total Recorded Investment	192	1,853
Related Allowance	0	381
Average recorded investment	991	2,139
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	139	88
Recorded Investment With No Allowance	121	130
Recorded Investment With Allowance	0	0
Total Recorded Investment	121	130
Related Allowance	0	0
Average recorded investment	200	184
Overdraft Protection Lines [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0	0
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Average recorded investment	0	0
Overdrafts [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0	0
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Average recorded investment	0	0
Total Installment and Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	139	88
Recorded Investment With No Allowance	121	130
Recorded Investment With Allowance	0	0
Total Recorded Investment	121	130
Related Allowance	0	0
Average recorded investment	200	184
Lease Financing [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0	0
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Average recorded investment	$ 0	$ 55