Loans and Leases, Part IV (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 contract loan	Sep. 30, 2012 contract	Sep. 30, 2013 contract loan	Sep. 30, 2012 contract	Dec. 31, 2012 loan
Troubled Debt Restructurings [Abstract]
Number of Contracts	22	2	40	8
Pre-Modification Outstanding Recorded Investment	$ 2,103	$ 156	$ 2,561	$ 1,477
Post-Modification Outstanding Recorded Investment	2,103	151	2,540	1,465
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts in Default	0	0	1	0
Recorded Investment on Defaulted TDRs	0	0	106	0
Number of restructured loans	56		56		58
Total restructured loans	13,340		13,340		16,773
TDR activity by loan category [Roll Forward]
Beginning balance	14,316	16,762	16,773	19,050
Defaults	0	0	(106)	0
Additions	2,103	151	3,945	1,465
Principal reductions	(3,079)	(731)	(7,272)	(4,333)
Ending balance	13,340	16,182	13,340	16,182
Allowance for loan loss	941	611	941	611
Commercial and Business Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	2	0	2
Pre-Modification Outstanding Recorded Investment	0	156	0	156
Post-Modification Outstanding Recorded Investment	0	151	0	151
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts in Default	0	0	0	0
Recorded Investment on Defaulted TDRs	0	0	0	0
Commercial and Industrial [Member]
TDR activity by loan category [Roll Forward]
Beginning balance	812	2,359	990	2,619
Defaults	0	0	0	0
Additions	0	151	0	151
Principal reductions	(114)	(48)	(292)	(308)
Ending balance	698	2,462	698	2,462
Allowance for loan loss	5	152	5	152
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 in Default	0	0	0	0
Recorded Investment on Defaulted TDRs	0	0	0	0
Commercial Real Estate Term Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	5
Pre-Modification Outstanding Recorded Investment	0	0	0	992
Post-Modification Outstanding Recorded Investment	0	0	0	914
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts in Default	0	0	1	0
Recorded Investment on Defaulted TDRs	0	0	106	0
TDR activity by loan category [Roll Forward]
Beginning balance	4,215	6,355	5,395	6,850
Defaults	0	0	(106)	0
Additions	0	0	0	914
Principal reductions	(39)	(47)	(1,113)	(1,456)
Ending balance	4,176	6,308	4,176	6,308
Allowance for loan loss	739	325	739	325
Residential Mortgages [Member]
TDR activity by loan category [Roll Forward]
Beginning balance	6,783	3,774	7,289	3,457
Defaults	0	0	0	0
Additions	0	0	0	324
Principal reductions	(1,470)	(128)	(1,976)	(135)
Ending balance	5,313	3,646	5,313	3,646
Allowance for loan loss	109	128	109	128
Single Family Residential Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	1
Pre-Modification Outstanding Recorded Investment	0	0	0	329
Post-Modification Outstanding Recorded Investment	0	0	0	324
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts in Default	0	0	0	0
Recorded Investment on Defaulted TDRs	0	0	0	0
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 in Default	0	0	0	0
Recorded Investment on Defaulted TDRs	0	0	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	44	12	10	36
Defaults	0	0	0	0
Additions	0	0	44	0
Principal reductions	(44)	(1)	(54)	(25)
Ending balance	0	11	0	11
Allowance for loan loss	0	0	0	0
Installment and Other [Member]
TDR activity by loan category [Roll Forward]
Beginning balance	0	58	38	54
Defaults	0	0	0	0
Additions	0	0	0	20
Principal reductions	0	(18)	(38)	(34)
Ending balance	0	40	0	40
Allowance for loan loss	0	0	0	0
RE Construction and Development Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	22	0	40	0
Pre-Modification Outstanding Recorded Investment	2,103	0	2,561	0
Post-Modification Outstanding Recorded Investment	2,103	0	2,540	0
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts in Default	0	0	0	0
Recorded Investment on Defaulted TDRs	0	0	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	2,411	4,147	2,860	6,034
Defaults	0	0	0	0
Additions	2,103	0	3,901	0
Principal reductions	(1,409)	(488)	(3,656)	(2,375)
Ending balance	3,105	3,659	3,105	3,659
Allowance for loan loss	88	6	88	6
Agricultural [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	56
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts in Default	0	0	0	0
Recorded Investment on Defaulted TDRs	0	0	0	0
TDR activity by loan category [Roll Forward]
Beginning balance	51	57	191	0
Defaults	0	0	0	0
Additions	0	0	0	56
Principal reductions	(3)	(1)	(143)	0
Ending balance	48	56	48	56
Allowance for loan loss	0	0	0	0
Consumer 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	20
Troubled debt restructuring that defaulted [Abstract]
Number of Contracts in Default	0	0	0	0
Recorded Investment on Defaulted TDRs	0	0	0	0
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 in Default	0	0	0	0
Recorded Investment on Defaulted TDRs	0	0	0	0
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 in Default	0	0	0	0
Recorded Investment on Defaulted TDRs	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