Variable Interest Entities - VIE Carrying Amounts Included in Financial Statements (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Loans receivable	$ 11,618,731	$ 9,512,810
Accrued interest receivable	91,393	56,047
Other assets	105,741	81,371
Total assets	17,926,067	13,683,999
Liabilities
Other borrowed funds	32,967	28,820
Accrued interest payable	3,951	4,686
Other liabilities	204,041	164,954
Total liabilities	15,670,978	11,723,266
Consolidated VIEs
Assets
Loans receivable	90,183	84,390
Accrued interest receivable	457	63
Other assets	55,863	54,692
Total assets	146,503	139,145
Liabilities
Other borrowed funds	27,050	23,149
Accrued interest payable	167	36
Other liabilities	47	123
Total liabilities	$ 27,264	$ 23,308