Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012 Loan	Mar. 31, 2012 Loan
Troubled Debt Restructuring
Number	10,000	15,000
Pre-modification out-standing principal balance	$ 1,938	$ 3,164
Post-modification out-standing principal balance	1,979	3,175
Financial Impact due to troubled debt restructure taken as additional provision	90	16
Number that defaulted during the period	8,000	6,000
Recorded investment of TDRs that defaulted during the period	2,587	2,783
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	36
RE Mortgage [Member] | Residential [Member]
Troubled Debt Restructuring
Number	1,000	2,000
Pre-modification out-standing principal balance	71	650
Post-modification out-standing principal balance	72	669
Financial Impact due to troubled debt restructure taken as additional provision	(11)
Number that defaulted during the period		1,000
Recorded investment of TDRs that defaulted during the period		112
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions
RE Mortgage [Member] | Commercial [Member]
Troubled Debt Restructuring
Number	3,000	7,000
Pre-modification out-standing principal balance	1,050	1,561
Post-modification out-standing principal balance	1,050	1,523
Financial Impact due to troubled debt restructure taken as additional provision	57
Number that defaulted during the period	3,000	4,000
Recorded investment of TDRs that defaulted during the period	1,046	2,632
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions
Home Equity Lines [Member]
Troubled Debt Restructuring
Number	6,000	2,000
Pre-modification out-standing principal balance	817	436
Post-modification out-standing principal balance	857	464
Financial Impact due to troubled debt restructure taken as additional provision	44	16
Number that defaulted during the period	1,000
Recorded investment of TDRs that defaulted during the period	274
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	(13)
Home equity loans [Member]
Troubled Debt Restructuring
Number
Pre-modification out-standing principal balance
Post-modification out-standing principal balance
Financial Impact due to troubled debt restructure taken as additional provision
Number that defaulted during the period	1,000
Recorded investment of TDRs that defaulted during the period	46
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	(1)
Auto Indirect [Member]
Troubled Debt Restructuring
Number
Pre-modification out-standing principal balance
Post-modification out-standing principal balance
Financial Impact due to troubled debt restructure taken as additional provision
Number that defaulted during the period
Recorded investment of TDRs that defaulted during the period
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions
Other Consumer [Member]
Troubled Debt Restructuring
Number		1,000
Pre-modification out-standing principal balance		38
Post-modification out-standing principal balance		38
Financial Impact due to troubled debt restructure taken as additional provision
Number that defaulted during the period
Recorded investment of TDRs that defaulted during the period
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions
C&I [Member]
Troubled Debt Restructuring
Number		1,000
Pre-modification out-standing principal balance		249
Post-modification out-standing principal balance		249
Financial Impact due to troubled debt restructure taken as additional provision
Number that defaulted during the period	2,000
Recorded investment of TDRs that defaulted during the period	1,124
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	50
Construction [Member] | Residential [Member]
Troubled Debt Restructuring
Number		2,000
Pre-modification out-standing principal balance		230
Post-modification out-standing principal balance		232
Financial Impact due to troubled debt restructure taken as additional provision
Number that defaulted during the period	1,000
Recorded investment of TDRs that defaulted during the period	97
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions
Construction [Member] | Commercial [Member]
Troubled Debt Restructuring
Number
Pre-modification out-standing principal balance
Post-modification out-standing principal balance
Financial Impact due to troubled debt restructure taken as additional provision
Number that defaulted during the period		1,000
Recorded investment of TDRs that defaulted during the period		39
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions