Variable Interest Entities - VIE Carrying Amounts Included in Financial Statements (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Loans receivable	$ 11,269,929	$ 11,122,696
Accrued interest receivable	79,331	75,497
Other assets	113,273	106,505
Total assets	19,770,552	18,504,206
Liabilities
Other borrowed funds	33,452	33,068
Accrued interest payable	2,590	3,305
Other liabilities	202,308	194,861
Total liabilities	17,475,167	16,197,165
Consolidated VIEs
Assets
Loans receivable	108,717	90,183
Accrued interest receivable	546	410
Other assets	40,262	40,282
Total assets	149,525	130,875
Liabilities
Other borrowed funds	27,588	27,176
Accrued interest payable	131	53
Other liabilities	51	171
Total liabilities	$ 27,770	$ 27,400