Dividend Restrictions and Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Company
Common Equity Tier 1 Capital, Amount [Abstract]
Actual Amount	$ 166,968	$ 158,350
Required for Capital Adequacy Purposes	$ 83,476	$ 68,972
Common Equity Tier 1 Capital, Ratios [Abstract]
Actual Ratio	11.50%	11.77%
Required for Capital Adequacy Purposes	5.75%	5.125%
Tier 1 Capital, Actual Amount [Abstract]
Actual Amount	$ 194,794	$ 186,074
Required for Capital Adequacy Purposes	$ 105,253	$ 89,159
Tier 1 Capital, Ratios [Abstract]
Actual Ratio	13.42%	13.83%
Required for Capital Adequacy Purposes	7.25%	6.625%
Total Capital, Actual Amount [Abstract]
Actual Amount	$ 208,973	$ 199,375
Required for Capital Adequacy Purposes	$ 134,288	$ 116,075
Total Capital, Ratios [Abstract]
Actual Ratio	14.39%	14.81%
Required for Capital Adequacy Purposes	9.25%	8.625%
Leverage Capital, Actual Amount [Abstract]
Actual Amount	$ 194,794	$ 186,074
Required for Capital Adequacy Purposes	$ 71,128	$ 63,761
Leverage Capital, Ratios [Abstract]
Actual Ratio	10.95%	11.67%
Required for Capital Adequacy Purposes	4.00%	4.00%
Bank
Common Equity Tier 1 Capital, Amount [Abstract]
Actual Amount	$ 184,656	$ 172,927
Required for Capital Adequacy Purposes	83,024	68,580
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 93,854	$ 86,979
Common Equity Tier 1 Capital, Ratios [Abstract]
Actual Ratio	12.79%	12.92%
Required for Capital Adequacy Purposes	5.75%	5.125%
To Be Well Capitalized Under Prompt Corrective Action Provisions	6.50%	6.50%
Tier 1 Capital, Actual Amount [Abstract]
Actual Amount	$ 184,656	$ 172,927
Required for Capital Adequacy Purposes	104,683	88,652
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 115,512	$ 107,051
Tier 1 Capital, Ratios [Abstract]
Actual Ratio	12.79%	12.92%
Required for Capital Adequacy Purposes	7.25%	6.625%
To Be Well Capitalized Under Prompt Corrective Action Provisions	8.00%	8.00%
Total Capital, Actual Amount [Abstract]
Actual Amount	$ 198,465	$ 185,931
Required for Capital Adequacy Purposes	133,561	115,415
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 144,390	$ 133,814
Total Capital, Ratios [Abstract]
Actual Ratio	13.75%	13.89%
Required for Capital Adequacy Purposes	9.25%	8.625%
To Be Well Capitalized Under Prompt Corrective Action Provisions	10.00%	10.00%
Leverage Capital, Actual Amount [Abstract]
Actual Amount	$ 184,656	$ 172,927
Required for Capital Adequacy Purposes	70,796	63,571
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 88,495	$ 79,464
Leverage Capital, Ratios [Abstract]
Actual Ratio	10.43%	10.88%
Required for Capital Adequacy Purposes	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions	5.00%	5.00%