Fair Value of Financial Instruments - Quantitative Information (Details) - Appraisal of collateral valuation technique [Member] - Level 3 [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Impaired loans and leases [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Impaired Loans And Leases Fair Value	$ 2,300	$ 6,102
Other real estate owned [Member]
Additional quantitative information about assets measured at fair value on a nonrecurring basis [Abstract]
Foreclosed Properties Valued On Nonrecurring Basis	$ 925	$ 1,471
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)	0.00%	0.00%
Range (Weighted Average) of Liquidation expenses (in hundredths	0.00%	0.00%
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)	0.00%	0.00%
Range (Weighted Average) of Liquidation expenses (in hundredths	0.00%	0.00%
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)	(20.00%)	(27.40%)
Range (Weighted Average) of Liquidation expenses (in hundredths	(8.20%)	(12.80%)
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)	(43.80%)	(61.50%)
Range (Weighted Average) of Liquidation expenses (in hundredths	(5.00%)	(5.60%)
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)	(15.40%)	(12.30%)
Range (Weighted Average) of Liquidation expenses (in hundredths	(3.40%)	(5.20%)
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)	(24.00%)	(32.50%)
Range (Weighted Average) of Liquidation expenses (in hundredths	(5.00%)	(5.60%)