Parent Company only Condensed Financial Information - Balance Sheets (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 164,568,000	$ 316,222,000
Total assets	3,096,562,000	2,843,452,000	$ 2,570,880,000
Liabilities and Shareholders' Equity
Subordinated debt, net of issuance costs	39,369,000	39,183,000
Shareholder's equity	367,466,000	271,239,000	$ 259,850,000	$ 245,436,000
Total liabilities and shareholders' equity	3,096,562,000	2,843,452,000
HCC (Parent)
Assets
Cash and cash equivalents	21,358,000	22,940,000
Investment in subsidiary bank	384,516,000	286,770,000
Other assets	1,194,000	916,000
Total assets	407,068,000	310,626,000
Liabilities and Shareholders' Equity
Subordinated debt, net of issuance costs	39,369,000	39,183,000
Other liabilities	233,000	204,000
Shareholder's equity	367,466,000	271,239,000
Total liabilities and shareholders' equity	$ 407,068,000	$ 310,626,000