Parent Company only Condensed Financial Information - Statements of Cash Flows (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
Cash flows from operating activities:
Net Income	$ 5,685	$ 11,277	$ 11,353	$ 12,146	$ 13,232	$ 12,375	$ 915	$ 8,809	$ 40,461	$ 35,331	$ 23,828
Adjustments to reconcile net income to net cash provided by operations:
Amortization of restricted stock award, net									1,283	1,109	912
Net cash provided by operating activities									50,343	48,572	41,358
Cash flows from financing activities:
Issuance of subordinated debt, net of issuance costs											39,073
Proceeds from exercise of stock options									1,626	2,667	1,368
Net cash provided by (used in) financing activities									(28,780)	(277,882)	246,052
Net increase (decrease) in cash and cash equivalents									292,802	(151,654)	50,119
Cash and cash equivalents, beginning of period				164,568				316,222	164,568	316,222	266,103
Cash and cash equivalents, end of period	457,370				164,568				457,370	164,568	316,222
HCC (Parent)
Cash flows from operating activities:
Net Income									40,461	35,331	23,828
Adjustments to reconcile net income to net cash provided by operations:
Amortization of restricted stock award, net									1,283	1,109	912
Equity in undistributed net income of subsidiary bank									(21,757)	(22,161)	(10,078)
Net change in other assets and liabilities									12	(64)	224
Net cash provided by operating activities									19,999	14,215	14,886
Cash flows from financing activities:
Equity investment in subsidiary bank											(20,000)
Payment of cash dividends									(22,723)	(18,464)	(15,238)
Issuance of subordinated debt, net of issuance costs											39,073
Proceeds from exercise of stock options									1,626	2,667	1,368
Net cash provided by (used in) financing activities									(21,097)	(15,797)	5,203
Net increase (decrease) in cash and cash equivalents									(1,098)	(1,582)	20,089
Cash and cash equivalents, beginning of period				$ 21,358				$ 22,940	21,358	22,940	2,851
Cash and cash equivalents, end of period	$ 20,260				$ 21,358				$ 20,260	$ 21,358	$ 22,940