Condensed Financial Information (Parent Company Only) (Balance sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 13,909	$ 25,855
Total assets	6,371,928	3,884,163	$ 3,393,133
Liabilities
Other liabilities	41,769	20,943
Total liabilities	5,718,200	3,462,926
Total shareholders' equity	653,728	421,237	$ 367,474	$ 206,288
Total liabilities and shareholders' equity	6,371,928	3,884,163
Reportable Legal Entities | Company
Assets
Cash and cash equivalents	463	2,224
Investment in subsidiaries	664,878	453,028
Other assets	2,213	2,104
Total assets	667,554	457,356
Liabilities
Lines of credit		25,000
Short-term subordinated debt	12,200	10,582
Other liabilities	1,626	537
Total liabilities	13,826	36,119
Total shareholders' equity	653,728	421,237
Total liabilities and shareholders' equity	$ 667,554	$ 457,356