Fair Value of Financial Instruments - Quantitative Information (Details) (Significant Unobservable Inputs Level 3 [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Maximum [Member] | Impaired loans and leases [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Liquidation expenses (in hundredths)	0.00%	[1]
Minimum [Member] | Impaired loans and leases [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Liquidation expenses (in hundredths)	(21.60%)	[1]
Weighted Average [Member] | Impaired loans and leases [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Liquidation expenses (in hundredths)	(7.00%)	[1]
Appraisal of collateral valuation technique [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Assets, Fair Value	4,896
Appraisal of collateral valuation technique [Member] | Maximum [Member] | Other real estate owned [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Appraisal adjustments (in hundredths)	0.00%	[1]
Appraisal of collateral valuation technique [Member] | Maximum [Member] | Impaired loans and leases [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Appraisal adjustments (in hundredths)	0.00%	[1]
Appraisal of collateral valuation technique [Member] | Minimum [Member] | Other real estate owned [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Appraisal adjustments (in hundredths)	(81.10%)	[1]
Appraisal of collateral valuation technique [Member] | Minimum [Member] | Impaired loans and leases [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Appraisal adjustments (in hundredths)	(69.90%)	[1]
Appraisal of collateral valuation technique [Member] | Weighted Average [Member] | Other real estate owned [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Appraisal adjustments (in hundredths)	(4.30%)	[1]
Appraisal of collateral valuation technique [Member] | Weighted Average [Member] | Impaired loans and leases [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Appraisal adjustments (in hundredths)	(22.00%)	[1]
Salvageable value of collateral valuation technique [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Range (Weighted Average) of Salvageable value of collateral (in hundredths)	0.00%	[2]
Salvageable value of collateral valuation technique [Member] | Other real estate owned [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Assets, Fair Value	3,727
Sales prices [Member] | Loans and leases held for sale [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Assets, Fair Value	1,572
Range (Weighted Average) of Appraisal adjustments (in hundredths)	(5.60%)
Range (Weighted Average) of Liquidation expenses (in hundredths)	(12.70%)

[1] Appraisals may be adjusted for qualitative factors such as interior condition of the property and liquidation expenses.

[2] Leases are measured using the salvageable value of the collateral.