Fair Value (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Total debt securities, Fair Value	$ 162,422	$ 179,219
Minimum
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value input discount rate	9.10%
Maximum
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value input discount rate	14.74%
Trust preferred securities
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Total debt securities, Fair Value	$ 895	$ 825
Trust preferred securities | Minimum
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value input discount rate	9.10%	9.69%
Trust preferred securities | Maximum
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value input discount rate	14.74%	15.11%
Trust preferred securities | Discounted Cash Flow
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Total debt securities, Fair Value	$ 895	$ 825
Impaired Loans
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Appraisal Adjustments		20.00%
Impaired Loans | Minimum
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value input discount rate	4.50%
Liquidation Expenses		8.00%
Impaired Loans | Maximum
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value input discount rate	5.38%
Liquidation Expenses		12.00%
Impaired Loans | Weighted average
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value input discount rate	4.88%
Appraisal Adjustments		20.00%
Liquidation Expenses		10.00%
Impaired Loans | Appraisal Of Collateral
Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis
Total debt securities, Fair Value	$ 4,891	$ 1,001