Parent Company only Condensed Financial Information - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed statements of income
Interest expense	$ (3,242)	$ (2,625)	$ (2,573)	$ (2,407)	$ (2,318)	$ (2,159)	$ (1,816)	$ (1,529)	$ (10,847)	$ (7,822)	$ (5,387)
Income before income taxes	7,773	15,910	15,976	16,653	18,370	17,354	884	12,047	56,312	48,655	50,299
Equity in undistributed net income of subsidiary bank:
Income tax benefit	(2,088)	(4,633)	(4,623)	(4,507)	(5,138)	(4,979)	31	(3,238)	(15,851)	(13,324)	(26,471)
Net income	$ 5,685	$ 11,277	$ 11,353	$ 12,146	$ 13,232	$ 12,375	$ 915	$ 8,809	40,461	35,331	23,828
HCC (Parent)
Condensed statements of income
Dividend from subsidiary bank									22,500	17,000	16,000
Other Income									121		114
Interest expense									(2,314)	(2,315)	(1,394)
Other expenses									(3,084)	(3,030)	(2,270)
Income before income taxes									17,223	11,655	12,450
Equity in undistributed net income of subsidiary bank:
Undistributed net income of subsidiary bank									21,757	22,161	10,078
Income tax benefit									1,481	1,515	1,300
Net income									$ 40,461	$ 35,331	$ 23,828