Variable Interest Entities - VIE Carrying Amounts Included in Financial Statements (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Loans receivable, net	$ 11,140,282	$ 10,964,453
Accrued interest receivable	79,699	75,497
Other assets	120,028	106,505
Total assets	21,314,019	18,504,206
Liabilities
Other borrowed funds	33,671	33,068
Accrued interest payable	2,437	3,305
Other liabilities	211,647	194,861
Total liabilities	18,926,403	16,197,165
Consolidated VIEs
Assets
Loans receivable, net	108,717	90,183
Accrued interest receivable	603	410
Other assets	41,135	40,282
Total assets	150,455	130,875
Liabilities
Other borrowed funds	27,861	27,176
Accrued interest payable	174	53
Other liabilities	51	171
Total liabilities	$ 28,086	$ 27,400