Loans and Leases, Part III (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 22,431,000		$ 22,431,000		$ 33,355,000
Recorded Investment With No Allowance	8,304,000		8,304,000		18,101,000
Recorded Investment With Allowance	12,839,000		12,839,000		13,781,000
Total Recorded Investment	21,143,000		21,143,000		31,882,000
Related Allowance	913,000		913,000		1,254,000
Average recorded investment	24,800,000	39,000,000	28,317,000	44,500,000	41,938,000
Income received on impaired loans	113,000	165,000	366,000	477,000
Commercial and Business Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,386,000		3,386,000		6,521,000
Recorded Investment With No Allowance	1,060,000		1,060,000		4,002,000
Recorded Investment With Allowance	2,179,000		2,179,000		2,425,000
Total Recorded Investment	3,239,000		3,239,000		6,427,000
Related Allowance	152,000		152,000		112,000
Average recorded investment			6,499,000		11,102,000
Government Program Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	459,000		459,000		704,000
Recorded Investment With No Allowance	103,000		103,000		212,000
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	103,000		103,000		212,000
Related Allowance	0		0		0
Average recorded investment			162,000		301,000
Total Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,845,000		3,845,000		7,225,000
Recorded Investment With No Allowance	1,163,000		1,163,000		4,214,000
Recorded Investment With Allowance	2,179,000		2,179,000		2,425,000
Total Recorded Investment	3,342,000		3,342,000		6,639,000
Related Allowance	152,000		152,000		112,000
Average recorded investment			6,661,000		11,403,000
Commerical Real Estate Term Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	7,936,000		7,936,000		8,457,000
Recorded Investment With No Allowance	1,524,000		1,524,000		4,209,000
Recorded Investment With Allowance	6,099,000		6,099,000		4,094,000
Total Recorded Investment	7,623,000		7,623,000		8,303,000
Related Allowance	581,000		581,000		523,000
Average recorded investment			7,859,000		7,258,000
Single Family Residential Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,862,000		3,862,000
Recorded Investment With No Allowance	1,123,000		1,123,000
Recorded Investment With Allowance	2,693,000		2,693,000
Total Recorded Investment	3,816,000		3,816,000
Related Allowance	128,000		128,000
Average recorded investment			3,672,000
Home Improvement and Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	11,000		11,000		36,000
Recorded Investment With No Allowance	11,000		11,000		22,000
Recorded Investment With Allowance	0		0		15,000
Total Recorded Investment	11,000		11,000		37,000
Related Allowance	0		0		1,000
Average recorded investment			24,000		96,000
Total Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	11,809,000		11,809,000		12,062,000
Recorded Investment With No Allowance	2,658,000		2,658,000		4,725,000
Recorded Investment With Allowance	8,792,000		8,792,000		7,146,000
Total Recorded Investment	11,450,000		11,450,000		11,871,000
Related Allowance	709,000		709,000		690,000
Average recorded investment			11,555,000		10,973,000
Total RE Construction and Development Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	5,765,000		5,765,000		11,535,000
Recorded Investment With No Allowance	4,200,000		4,200,000		9,014,000
Recorded Investment With Allowance	1,460,000		1,460,000		2,418,000
Total Recorded Investment	5,660,000		5,660,000		11,432,000
Related Allowance	6,000		6,000		71,000
Average recorded investment			8,690,000		17,184,000
Total Agricultural Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	505,000		505,000		2,445,000
Recorded Investment With No Allowance	193,000		193,000		61,000
Recorded Investment With Allowance	0		0		1,792,000
Total Recorded Investment	193,000		193,000		1,853,000
Related Allowance	0		0		381,000
Average recorded investment			1,191,000		2,139,000
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	507,000		507,000		88,000
Recorded Investment With No Allowance	90,000		90,000		87,000
Recorded Investment With Allowance	408,000		408,000		0
Total Recorded Investment	498,000		498,000		87,000
Related Allowance	46,000		46,000		0
Average recorded investment			220,000		184,000
Overdraft Protection Lines [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0		0		0
Recorded Investment With No Allowance	0		0		0
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	0		0		0
Related Allowance	0		0		0
Average recorded investment			0		0
Overdraft [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0		0		0
Recorded Investment With No Allowance	0		0		0
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	0		0		0
Related Allowance	0		0		0
Average recorded investment			0		0
Total Installment and Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	507,000		507,000		88,000
Recorded Investment With No Allowance	90,000		90,000		87,000
Recorded Investment With Allowance	408,000		408,000		0
Total Recorded Investment	498,000		498,000		87,000
Related Allowance	46,000		46,000		0
Average recorded investment			220,000		184,000
Residential Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance					3,569,000
Recorded Investment With No Allowance					494,000
Recorded Investment With Allowance					3,037,000
Total Recorded Investment					3,531,000
Related Allowance					166,000
Average recorded investment					3,619,000
Commercial Lease Financing [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0		0		0
Recorded Investment With No Allowance	0		0		0
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	0		0		0
Related Allowance	0		0		0
Average recorded investment			$ 0		$ 55,000