Parent Company Statements - Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 159,266	$ 131,254	$ 98,962	$ 113,693
Other assets	77,257	38,487
Total assets	7,211,734	3,468,992
Liabilities and stockholders’ equity
Stockholders’ equity	982,276	426,167	$ 399,589	$ 373,286
Total liabilities and stockholders’ equity	7,211,734	3,468,992
Parent Company [Member]
Assets
Cash and cash equivalents	58,017	18,011
Investment in banking subsidiary	962,675	419,496
Investment in non-bank subsidiaries	39,699	24,103
Other assets	7,103	1,169
Total assets	1,067,494	462,779
Liabilities and stockholders’ equity
Subordinated debentures	84,860	36,083
Accrued liabilities	358	529
Stockholders’ equity	982,276	426,167
Total liabilities and stockholders’ equity	$ 1,067,494	$ 462,779