Loans and Leases, Part IV (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Troubled Debt Restructurings [Abstract]
Number of Contracts	2	2	7	11
Pre-Modification Outstanding Recorded Investment	$ 156,000	$ 2,449,000	$ 1,477,000	$ 6,551,000
Post-Modification Outstanding Recorded Investment	151,000	2,023,000	1,465,000	5,974,000
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	4
Recorded Investment	0	0	0	365,000
Number of restructured loans	43		43		41
Total restructured loans	16,200,000		16,200,000		19,000,000
TDR activity by loan category [Roll Forward]
Beginning balance	16,761,000	22,932,000	19,050,000	24,934,000
Defaults	0	0	0	(333,000)
Additions	151,000	2,360,000	2,887,000	5,785,000
Principal reductions	(730,000)	(5,359,000)	(5,755,000)	(10,453,000)
Ending balance	16,182,000	19,933,000	16,182,000	19,933,000
Allowance for loan loss	611,000	719,000	611,000	719,000
Commercial and Business Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	2	0	2	5
Pre-Modification Outstanding Recorded Investment	156,000	0	156,000	2,240,000
Post-Modification Outstanding Recorded Investment	151,000	0	151,000	1,796,000
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	2
Recorded Investment	0	0	0	22,000
Government Program Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	0
Recorded Investment	0	0	0	0
Total Commercial and Industrial [Member]
TDR activity by loan category [Roll Forward]
Beginning balance	2,359,000	4,594,000	2,619,000	2,751,000
Defaults	0	0	0	(89,000)
Additions	151,000	337,000	151,000	2,064,000
Principal reductions	(48,000)	(2,109,000)	(308,000)	(1,904,000)
Ending balance	2,462,000	2,822,000	2,462,000	2,822,000
Allowance for loan loss	152,000	186,000	152,000	186,000
Commercial Real Estate Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	1	5	2
Pre-Modification Outstanding Recorded Investment	0	1,924,000	1,321,000	3,329,000
Post-Modification Outstanding Recorded Investment	0	1,500,000	1,314,000	3,223,000
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	0
Recorded Investment	0	0	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	6,354,000	6,172,000	6,850,000	5,019,000
Defaults	0	0	0	(228,000)
Additions	0	1,500,000	2,451,000	2,771,000
Principal reductions	(46,000)	(543,000)	(2,993,000)	(433,000)
Ending balance	6,308,000	7,129,000	6,308,000	7,129,000
Allowance for loan loss	325,000	307,000	325,000	307,000
Single Family Residential Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	1	0	2
Pre-Modification Outstanding Recorded Investment	0	525,000	0	852,000
Post-Modification Outstanding Recorded Investment	0	523,000	0	852,000
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	1
Recorded Investment	0	0	0	327,000
Home Improvement and Home Equity Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	0
Recorded Investment	0	0	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	12,000	108,000	36,000	93,000
Defaults	0	0	0	0
Additions	0	0	0	0
Principal reductions	(1,000)	(20,000)	(25,000)	(5,000)
Ending balance	11,000	88,000	11,000	88,000
Allowance for loan loss	0	0	0	0
RE Construction and Development [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	0
Recorded Investment	0	0	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	4,147,000	8,382,000	6,034,000	13,730,000
Defaults	0	0	0	0
Additions	0	0	0	0
Principal reductions	(488,000)	(2,139,000)	(2,375,000)	(7,487,000)
Ending balance	3,659,000	6,243,000	3,659,000	6,243,000
Allowance for loan loss	6,000	80,000	6,000	80,000
Agricultural Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	0
Recorded Investment	0	0	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	57,000	0	0	0
Defaults	0	0	0	0
Additions	0	0	56,000	0
Principal reductions	(1,000)	0	0	0
Ending balance	56,000	0	56,000	0
Allowance for loan loss	0	0	0	0
Consumer Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	2
Pre-Modification Outstanding Recorded Investment	0	0	0	130,000
Post-Modification Outstanding Recorded Investment	0	0	0	103,000
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	1
Recorded Investment	0	0	0	16,000
Total Installment and Other [Member]
TDR activity by loan category [Roll Forward]
Beginning balance	58,000	162,000	34,000	80,000
Defaults	0	0	0	(16,000)
Additions	0	0	20,000	100,000
Principal reductions	(18,000)	(3,000)	(14,000)	(5,000)
Ending balance	40,000	159,000	40,000	159,000
Allowance for loan loss	0	12,000	0	12,000
Overdraft Protection Lines [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	0
Recorded Investment	0	0	0	0
Residential Mortgages [Member]
TDR activity by loan category [Roll Forward]
Beginning balance	3,774,000	3,514,000	3,477,000	3,261,000
Defaults	0	0	0	0
Additions	0	523,000	209,000	850,000
Principal reductions	(128,000)	(545,000)	(40,000)	(619,000)
Ending balance	3,646,000	3,492,000	3,646,000	3,492,000
Allowance for loan loss	128,000	134,000	128,000	134,000
Commercial Lease Financing [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts	0	0	0	0
Recorded Investment	0	0	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	0	0	0	0
Defaults	0	0	0	0
Additions	0	0	0	0
Principal reductions	0	0	0	0
Ending balance	0	0	0	0
Allowance for loan loss	$ 0	$ 0	$ 0	$ 0