Parent Company Only Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 668,462	$ 201,978
Deferred tax assets	23,030	23,763
Prepaid expenses and other assets	58,115	52,242
Total assets	5,666,814	4,995,457	$ 4,185,443
Liabilities:
Convertible notes payable, net	19,442	18,696
Subordinated debt, net	50,016	49,666
Accrued expenses and other liabilities	83,908	99,384
Total liabilities	5,142,776	4,509,670
Total stockholders’ equity	524,038	485,787	$ 430,201	$ 430,201
Total liabilities and stockholders’ equity	5,666,814	4,995,457
Parent Company
Assets
Cash and cash equivalents	11,141	16,948
Deferred tax assets	12,813	11,996
Prepaid expenses and other assets	10,621	6,870
Investment in and advances to subsidiaries	571,330	527,158
Total assets	605,905	562,972
Liabilities:
Convertible notes payable, net	19,442	18,696
Subordinated debt, net	50,016	49,666
Accrued expenses and other liabilities	12,409	8,823
Total liabilities	81,867	77,185
Total stockholders’ equity	524,038	485,787
Total liabilities and stockholders’ equity	$ 605,905	$ 562,972