Basis of Presentation (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Number of customers accounting for more than 10 percent of revenue for HBC or the Company			0
Number of operating segments | segment			2
Allowance for credit losses on debt securities	$ 55,000		$ 55,000				$ 58,000
Loans, net of deferred fees	2,696,024,000		2,696,024,000		$ 2,534,163,000
Allowance for credit losses on loans	45,444,000	$ 26,631,000	45,444,000	$ 26,631,000	23,285,000	$ 44,703,000	31,855,000	$ 27,318,000	$ 27,848,000
Allowance for credit losses on off-balance sheet credit exposures							679,000
Retained earnings	87,654,000		87,654,000		96,741,000
Income tax expense	4,274,000	$ 4,623,000	5,142,000	$ 9,130,000
Debt Securities, Held-to-maturity, Credit Loss reduction			(3,000)
Off-Balance Sheet, Credit Loss, Liability, Credit Loss reduction			(522,000)
ASU 2016-03 - Topic 326
Allowance for credit losses on loans					8,570,000
ASU 2016-03 - Topic 326 | Restatement Adjustment
Allowance for credit losses on debt securities					58,000
Allowance for credit losses on loans					8,570,000
Allowance for credit losses on off-balance sheet credit exposures					(207,000)
Retained earnings					(6,100,000)
Income tax expense					2,400,000
ASU 2016-03 - Topic 326 | Previously Reported
Allowance for credit losses on loans					23,285,000
Allowance for credit losses on off-balance sheet credit exposures					886,000
Commercial
Loans, net of deferred fees	878,393,000		878,393,000				6,790,000
Allowance for credit losses on loans	13,179,000		13,179,000		10,453,000	12,801,000	6,790,000
Commercial | ASU 2016-03 - Topic 326
Allowance for credit losses on loans					(3,663,000)
Commercial | ASU 2016-03 - Topic 326 | Restatement Adjustment
Loans, net of deferred fees					(3,663,000)
Commercial | ASU 2016-03 - Topic 326 | Previously Reported
Loans, net of deferred fees					10,453,000
CRE - owner occupied
Loans, net of deferred fees	553,463,000		553,463,000				6,994,000
Allowance for credit losses on loans	8,547,000		8,547,000		3,825,000	7,737,000	6,994,000
CRE - owner occupied | ASU 2016-03 - Topic 326
Allowance for credit losses on loans					3,169,000
CRE - owner occupied | ASU 2016-03 - Topic 326 | Restatement Adjustment
Loans, net of deferred fees					3,169,000
CRE - owner occupied | ASU 2016-03 - Topic 326 | Previously Reported
Loans, net of deferred fees					3,825,000
CRE - non-owner occupied
Loans, net of deferred fees	725,776,000		725,776,000		767,821,000		11,672,000
Allowance for credit losses on loans	15,449,000		15,449,000		3,760,000	15,645,000	11,672,000
CRE - non-owner occupied | ASU 2016-03 - Topic 326
Allowance for credit losses on loans					7,912,000
CRE - non-owner occupied | ASU 2016-03 - Topic 326 | Restatement Adjustment
Loans, net of deferred fees					7,912,000
CRE - non-owner occupied | ASU 2016-03 - Topic 326 | Previously Reported
Loans, net of deferred fees					3,760,000
Land and construction
Loans, net of deferred fees	138,284,000		138,284,000				1,458,000
Allowance for credit losses on loans	2,552,000		2,552,000		2,621,000	2,603,000	1,458,000
Land and construction | ASU 2016-03 - Topic 326
Allowance for credit losses on loans					(1,163,000)
Land and construction | ASU 2016-03 - Topic 326 | Restatement Adjustment
Loans, net of deferred fees					(1,163,000)
Land and construction | ASU 2016-03 - Topic 326 | Previously Reported
Loans, net of deferred fees					2,621,000
Home equity
Loans, net of deferred fees	112,679,000		112,679,000				1,321,000
Allowance for credit losses on loans	1,851,000		1,851,000		2,244,000	1,746,000	1,321,000
Home equity | ASU 2016-03 - Topic 326
Allowance for credit losses on loans					(923,000)
Home equity | ASU 2016-03 - Topic 326 | Restatement Adjustment
Loans, net of deferred fees					(923,000)
Home equity | ASU 2016-03 - Topic 326 | Previously Reported
Loans, net of deferred fees					2,244,000
Multi-family
Loans, net of deferred fees	169,637,000		169,637,000				1,253,000
Allowance for credit losses on loans	1,828,000		1,828,000		57,000	1,622,000	1,253,000
Multi-family | ASU 2016-03 - Topic 326
Allowance for credit losses on loans					1,196,000
Multi-family | ASU 2016-03 - Topic 326 | Restatement Adjustment
Loans, net of deferred fees					1,196,000
Multi-family | ASU 2016-03 - Topic 326 | Previously Reported
Loans, net of deferred fees					57,000
Residential mortgages
Loans, net of deferred fees	95,033,000		95,033,000				678,000
Allowance for credit losses on loans	825,000		825,000		243,000	708,000	678,000
Residential mortgages | ASU 2016-03 - Topic 326
Allowance for credit losses on loans					435,000
Residential mortgages | ASU 2016-03 - Topic 326 | Restatement Adjustment
Loans, net of deferred fees					435,000
Residential mortgages | ASU 2016-03 - Topic 326 | Previously Reported
Loans, net of deferred fees					243,000
Consumer and other
Loans, net of deferred fees	22,759,000		22,759,000				1,689,000
Allowance for credit losses on loans	$ 1,213,000		$ 1,213,000		82,000	$ 1,841,000	$ 1,689,000
Consumer and other | ASU 2016-03 - Topic 326
Allowance for credit losses on loans					1,607,000
Consumer and other | ASU 2016-03 - Topic 326 | Restatement Adjustment
Loans, net of deferred fees					1,607,000
Consumer and other | ASU 2016-03 - Topic 326 | Previously Reported
Loans, net of deferred fees					$ 82,000