Parent Company only Condensed Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net Income	$ 11,623	$ 11,197	$ 10,618	$ 1,861	$ 5,685	$ 11,277	$ 11,353	$ 12,146	$ 35,299	$ 40,461	$ 35,331
Adjustments to reconcile net income to net cash provided by operations:
Amortization of restricted stock award, net									1,689	1,283	1,109
Net cash provided by operating activities									58,086	50,343	48,572
Cash flows from financing activities:
Proceeds from exercise of stock options									1,714	1,626	2,667
Net cash provided by (used in) financing activities									470,025	(28,780)	(277,882)
Net increase in cash and cash equivalents									673,703	292,802	(151,654)
Cash and cash equivalents, beginning of period				457,370				164,568	457,370	164,568	316,222
Cash and cash equivalents, end of period	1,131,073				457,370				1,131,073	457,370	164,568
HCC (Parent)
Cash flows from operating activities:
Net Income									35,299	40,461	35,331
Adjustments to reconcile net income to net cash provided by operations:
Amortization of restricted stock award, net									1,689	1,283	1,109
Equity in undistributed net income of subsidiary bank									(7,255)	(21,757)	(22,161)
Net change in other assets and liabilities									(250)	12	(64)
Net cash provided by operating activities									29,483	19,999	14,215
Cash flows from financing activities:
Payment of cash dividends									(31,079)	(22,723)	(18,464)
Proceeds from exercise of stock options									1,714	1,626	2,667
Net cash provided by (used in) financing activities									(29,365)	(21,097)	(15,797)
Net increase in cash and cash equivalents									118	(1,098)	(1,582)
Cash and cash equivalents, beginning of period				$ 20,260				$ 21,358	20,260	21,358	22,940
Cash and cash equivalents, end of period	$ 20,378				$ 20,260				$ 20,378	$ 20,260	$ 21,358