Capital Requirements - Tabular Disclosure (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Total Capital (to risk-weighted assets)
Actual, Amount	$ 323,988	$ 288,754
Required For Capital Adequacy Purposes, Amount	$ 237,564	$ 185,338
Actual, Ratio (as a percent)	13.50%	14.40%
Required For Capital Adequacy Purposes, Ratio (as a percent)	9.875%	9.25%
Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 257,349	$ 229,258
Required For Capital Adequacy Purposes, Amount	$ 189,450	$ 145,265
Actual, Ratio (as a percent)	10.70%	11.40%
Required For Capital Adequacy Purposes, Ratio (as a percent)	7.875%	7.25%
Common Equity Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 257,349	$ 229,258
Required For Capital Adequacy Purposes, Amount	$ 153,364	$ 115,210
Actual, Ratio (as a percent)	10.70%	11.40%
Required For Capital Adequacy Purposes, Ratio (as a percent)	6.375%	5.75%
Tier 1 Capital (to average assets)
Actual, Amount	$ 257,349	$ 229,258
Required For Capital Adequacy Purposes, Amount	$ 118,108	$ 114,959
Actual, Ratio (as a percent)	8.70%	8.00%
Required For Capital Adequacy Purposes, Ratio (as a percent)	4.00%	4.00%
HBC (Wholly-owned Subsidiary)
Total Capital (to risk-weighted assets)
Actual, Amount	$ 300,635	$ 265,102
To Be Well Capitalized Under Regulatory Requirements, Amount	240,451	200,274
Required For Capital Adequacy Purposes, Amount	$ 237,445	$ 185,253
Actual, Ratio (as a percent)	12.50%	13.20%
To Be Well Capitalized Under Regulatory Requirements, Ratio (as a percent)	10.00%	10.00%
Required For Capital Adequacy Purposes, Ratio (as a percent)	9.875%	9.25%
Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 273,271	$ 244,790
To Be Well Capitalized Under Regulatory Requirements, Amount	192,361	160,219
Required For Capital Adequacy Purposes, Amount	$ 189,355	$ 145,198
Actual, Ratio (as a percent)	11.40%	12.20%
To Be Well Capitalized Under Regulatory Requirements, Ratio (as a percent)	8.00%	8.00%
Required For Capital Adequacy Purposes, Ratio (as a percent)	7.875%	7.25%
Common Equity Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 273,271	$ 244,790
To Be Well Capitalized Under Regulatory Requirements, Amount	156,293	130,178
Required For Capital Adequacy Purposes, Amount	$ 153,288	$ 115,157
Actual, Ratio (as a percent)	11.40%	12.20%
To Be Well Capitalized Under Regulatory Requirements, Ratio (as a percent)	6.50%	6.50%
Required For Capital Adequacy Purposes, Ratio (as a percent)	6.375%	5.75%
Tier 1 Capital (to average assets)
Actual, Amount	$ 273,271	$ 244,790
To Be Well Capitalized Under Regulatory Requirements, Amount	147,568	143,655
Required For Capital Adequacy Purposes, Amount	$ 118,054	$ 114,924
Actual, Ratio (as a percent)	9.30%	8.50%
To Be Well Capitalized Under Regulatory Requirements, Ratio (as a percent)	5.00%	5.00%
Required For Capital Adequacy Purposes, Ratio (as a percent)	4.00%	4.00%