Variable Interest Entities - VIE Carrying Amounts Included in Financial Statements (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Loans receivable	$ 11,238,048	$ 11,122,696
Accrued interest receivable	70,452	75,497
Other assets	125,547	106,505
Total assets	20,488,033	18,504,206
Liabilities
Other borrowed funds	33,556	33,068
Accrued interest payable	2,433	3,305
Other liabilities	202,993	194,861
Total liabilities	18,134,078	16,197,165
Consolidated VIEs
Assets
Loans receivable	108,717	90,183
Accrued interest receivable	574	410
Other assets	39,989	40,282
Total assets	149,280	130,875
Liabilities
Other borrowed funds	27,719	27,176
Accrued interest payable	149	53
Other liabilities	51	171
Total liabilities	$ 27,919	$ 27,400