Fair Value Accounting and Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets during 2017 and 2016, along with the valuation techniques used, are shown in the following tables:

	Fair value  at December 31, 2017		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
Impaired loans - collateral-dependent (3)	$	3,519	Fair Market Value of Collateral	Adjustment to Stated Value	N/A (2)
Impaired loans - other	$	3,058	Discounted Cash Flow	Discount Rate	3.75% - 7.75% (4.12%)
OREO	$	1,423	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount rate used in discounted cash flow valuation.
(2) Quantitative disclosures are not provided for collateral-dependent impaired loans and OREO because there were no adjustments made to the appraisal values or stated values during the current period.
(3) Collateral consists of real property and a government agency guarantee.

	Fair value  at December 31, 2016		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
Impaired loans - collateral-dependent (3)	$	2,248	Fair Market Value of Collateral	Adjustment to Stated Value	N/A (2)
Impaired loans - other	$	1,539	Discounted Cash Flow	Discount Rate	4.50% - 6.50% (5.26%)
OREO	$	4,388	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount rate used in discounted cash flow valuation.
(2) Quantitative disclosures are not provided for collateral-dependent impaired loans and OREO because there were no adjustments made to the appraisal values or stated values during the current period.
(3) Collateral consists of accounts receivable, inventory, equipment and real property.

Fair Value, Measurements, Nonrecurring [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Other Real Estate Owned Fair Value

$ 1,423

$ 4,388

Impaired loans

6,577

3,787

Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Other Real Estate Owned Fair Value

1,423

4,388

Impaired loans

6,577

3,787

Other Real Estate Owned, Fair Value Disclosure

$ 1,423

$ 4,388