Variable Interest Entities - VIE Carrying Amounts Included in Financial Statements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Loans receivable	$ 11,122,696	$ 9,512,810
Accrued interest receivable	75,497	56,047
Other assets	106,505	81,371
Total assets	18,504,206	13,683,999
Liabilities
Other borrowed funds	33,068	28,820
Accrued interest payable	3,305	4,686
Other liabilities	194,861	164,954
Total liabilities	16,197,165	11,723,266
Consolidated VIEs
Assets
Loans receivable	90,183	84,390
Accrued interest receivable	410	63
Other assets	40,282	41,233
Total assets	130,875	125,686
Liabilities
Other borrowed funds	27,176	23,149
Accrued interest payable	53	36
Other liabilities	171	123
Total liabilities	$ 27,400	$ 23,308