Loans Receivable and Allowance for Loan Losses - Loans Held For Investment - Sales or Reclassification to Held for Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Sales or reclassification to held for sale	$ 165,994	$ 21,581	$ 429
Real estate-Commercial
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Sales or reclassification to held for sale	25,988	0	429
Consumer
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Sales or reclassification to held for sale	$ 140,006	$ 21,581	$ 0