Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 327,361	$ 188,712
Premises and equipment, net	14,630	10,697
Accrued income and other assets	67,066	37,716
Total assets	4,100,083	3,541,692
Liabilities and shareholders’ equity
Subordinated debt, net of unamortized discounts and debt issuance costs of $2,472 in 2019 and $1,125 in 2018	69,528	33,875
Accrued expenses and other liabilities	53,002	21,470
Total liabilities	3,795,170	3,252,957
Total shareholders’ equity	304,913	288,735	$ 224,127	$ 153,942
Total liabilities and shareholders’ equity	4,100,083	3,541,692
Unamortized discounts and debt issuance costs	2,472	1,125
Parent Company
Assets
Cash and cash equivalents	38,303	45,281	$ 32,810	$ 29,365
Investment in common stock of subsidiaries	332,352	274,158
Premises and equipment, net	6,515	6,158
Accrued income and other assets	2,156	1,554
Total assets	379,326	327,151
Liabilities and shareholders’ equity
Subordinated debt, net of unamortized discounts and debt issuance costs of $2,472 in 2019 and $1,125 in 2018	69,528	33,875
Note payable to the Bank	3,000	3,300
Accrued expenses and other liabilities	1,885	1,241
Total liabilities	74,413	38,416
Total shareholders’ equity	304,913	288,735
Total liabilities and shareholders’ equity	379,326	$ 327,151
Unamortized discounts and debt issuance costs	$ 2,472