Loans and Leases, Part IV (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 Loan Contract	Mar. 31, 2012 Contract	Dec. 31, 2012 Loan
Troubled Debt Restructurings [Abstract]
Number of Contracts	11	4
Pre-Modification Outstanding Recorded Investment	$ 729,000	$ 1,318,000
Post-Modification Outstanding Recorded Investment	729,000	1,318,000
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	1	0
Recorded Investment	106,000	0
Number of restructured loans	55		58
Total restructured loans	14,900,000		16,800,000
TDR activity by loan category [Roll Forward]
Beginning balance	16,773,000	19,050,000
Defaults	(106,000)	0
Additions	729,000	1,368,000
Principal reductions	(2,462,000)	(2,658,000)
Ending balance	14,934,000	17,760,000
Allowance for loan loss	607,000	554,000
Commercial and Business Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0
Recorded Investment	0	0
Commercial and Industrial [Member]
TDR activity by loan category [Roll Forward]
Beginning balance	990,000	2,618,000
Defaults	0	0
Additions	0	0
Principal reductions	(113,000)	(149,000)
Ending balance	877,000	2,469,000
Allowance for loan loss	25,000	109,000
Government Program Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0
Recorded Investment	0	0
Commercial Real Estate Term Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	4
Pre-Modification Outstanding Recorded Investment	0	1,318,000
Post-Modification Outstanding Recorded Investment	0	1,310,000
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	1	0
Recorded Investment	106,000	0
TDR activity by loan category [Roll Forward]
Beginning balance	5,395,000	6,850,000
Defaults	(106,000)	0
Additions	0	983,000
Principal reductions	(1,031,000)	(1,420,000)
Ending balance	4,258,000	6,413,000
Allowance for loan loss	411,000	271,000
Residential Mortgages [Member]
TDR activity by loan category [Roll Forward]
Beginning balance	7,289,000	3,477,000
Defaults	0	0
Additions	0	327,000
Principal reductions	(388,000)	(16,000)
Ending balance	6,901,000	3,788,000
Allowance for loan loss	171,000	158,000
Single Family Residential Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0
Recorded Investment	0	0
Home Improvement and Home Equity Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0
Recorded Investment	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	10,000	37,000
Defaults	0	0
Additions	0	0
Principal reductions	(1,000)	(1,000)
Ending balance	9,000	36,000
Allowance for loan loss	0	1,000
Installment and Other [Member]
TDR activity by loan category [Roll Forward]
Beginning balance	38,000	34,000
Defaults	0	0
Additions	0	0
Principal reductions	0	(2,000)
Ending balance	38,000	32,000
Allowance for loan loss	0	0
RE Construction and Development Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	11	0
Pre-Modification Outstanding Recorded Investment	729,000	0
Post-Modification Outstanding Recorded Investment	729,000	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0
Recorded Investment	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	2,860,000	6,034,000
Defaults	0	0
Additions	729,000	0
Principal reductions	(928,000)	(1,070,000)
Ending balance	2,661,000	4,964,000
Allowance for loan loss	6,000	15,000
Agricultural Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0
Recorded Investment	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	191,000	0
Defaults	0	0
Additions	0	58,000
Principal reductions	(1,000)	0
Ending balance	190,000	58,000
Allowance for loan loss	0	0
Consumer Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0
Recorded Investment	0	0
Overdraft Protection Lines [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0
Recorded Investment	0	0
Commercial Lease Financing [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0
Recorded Investment	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	0	0
Defaults	0	0
Additions	0	0
Principal reductions	0	0
Ending balance	0	0
Allowance for loan loss	$ 0	$ 0