Capital Requirements - Tabular Disclosure (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Total Capital (to risk-weighted assets)
Actual, Amount	$ 479,366	$ 457,158
Required For Capital Adequacy Purposes, Amount	$ 315,142	$ 329,306
Actual, Ratio (as a percent)	0.160	0.146
Required For Capital Adequacy Purposes, Ratio (as a percent)	0.105	0.105
Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 404,973	$ 393,432
Required For Capital Adequacy Purposes, Amount	$ 255,115	$ 266,581
Actual, Ratio (as a percent)	0.135	0.125
Required For Capital Adequacy Purposes, Ratio (as a percent)	0.085	0.085
Common Equity Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 404,973	$ 393,432
Required For Capital Adequacy Purposes, Amount	$ 210,095	$ 219,538
Actual, Ratio (as a percent)	0.135%	0.125%
Required For Capital Adequacy Purposes, Ratio (as a percent)	0.07%	0.07%
Tier 1 Capital (to average assets)
Actual, Amount	$ 404,973	$ 393,432
Required For Capital Adequacy Purposes, Amount	$ 174,521	$ 161,677
Actual, Ratio (as a percent)	0.093	0.097
Required For Capital Adequacy Purposes, Ratio (as a percent)	0.040	0.040
HBC (Wholly-owned Subsidiary)
Total Capital (to risk-weighted assets)
Actual, Amount	$ 457,069	$ 435,757
To Be Well Capitalized Under Regulatory Requirements, Amount	299,993	313,485
Required For Capital Adequacy Purposes, Amount	$ 314,992	$ 329,159
Actual, Ratio (as a percent)	0.152	0.139
To Be Well Capitalized Under Regulatory Requirements, Ratio (as a percent)	0.100	0.100
Required For Capital Adequacy Purposes, Ratio (as a percent)	0.105	0.105
Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 422,369	$ 411,585
To Be Well Capitalized Under Regulatory Requirements, Amount	239,994	250,788
Required For Capital Adequacy Purposes, Amount	$ 254,994	$ 266,462
Actual, Ratio (as a percent)	0.141	0.131
To Be Well Capitalized Under Regulatory Requirements, Ratio (as a percent)	0.080	0.080
Required For Capital Adequacy Purposes, Ratio (as a percent)	0.085	0.085
Common Equity Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 422,369	$ 411,585
To Be Well Capitalized Under Regulatory Requirements, Amount	194,995	203,765
Required For Capital Adequacy Purposes, Amount	$ 209,995	$ 219,439
Actual, Ratio (as a percent)	0.141%	0.131%
To Be Well Capitalized Under Regulatory Requirements, Ratio (as a percent)	0.065%	0.065%
Required For Capital Adequacy Purposes, Ratio (as a percent)	0.07%	0.07%
Tier 1 Capital (to average assets)
Actual, Amount	$ 422,369	$ 411,585
To Be Well Capitalized Under Regulatory Requirements, Amount	218,066	202,013
Required For Capital Adequacy Purposes, Amount	$ 174,453	$ 161,611
Actual, Ratio (as a percent)	0.097	0.102
To Be Well Capitalized Under Regulatory Requirements, Ratio (as a percent)	0.050	0.050
Required For Capital Adequacy Purposes, Ratio (as a percent)	0.040	0.040