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Loans Receivable and Allowance for Credit Losses (Loan Purchases, Sales and Transfers) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Loans Receivable and Allowance for Credit Losses |  |  |  |
Loans transferred from held-for-investment to held-for-sale | $ 89,394,000 | $ 49,040,000 | $ 253,302,000 | $ 222,434,000
Sales | 124,084,000 | 55,663,000 | 306,342,000 | 229,182,000
Purchases | 18,132,000 | 68,965,000 | 163,822,000 | 395,250,000
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses | 2,800,000 | 36,000 | 2,800,000 | 426,000
Net gains on sales of loans | 361,000 | 2,037,000 | 1,443,000 | 2,967,000
Commercial and industrial (“C&I”) | Originated |  |  |  |
Loans Receivable and Allowance for Credit Losses |  |  |  |
Sales |  | 47,800,000 |  | 180,000,000.0
Commercial and industrial (“C&I”) | Single-family residential | Originated |  |  |  |
Loans Receivable and Allowance for Credit Losses |  |  |  |
Sales | 112,300,000 |  | 294,600,000 |
Loans sold in secondary market | Purchased |  |  |  |
Loans Receivable and Allowance for Credit Losses |  |  |  |
Sales | 11,800,000 | 7,900,000 | 11,800,000 | 49,200,000
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |
Loans Receivable and Allowance for Credit Losses |  |  |  |
Loans transferred from held-for-investment to held-for-sale | 89,394,000 | 34,071,000 | 246,052,000 | 189,237,000
Sales | 92,237,000 | 37,986,000 | 248,895,000 | 189,663,000
Purchases | 0 | 38,047,000 | 143,086,000 | 304,341,000
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses | 25,111,000 | 25,098,000 | 57,466,000 | 54,087,000
Commercial lending | Commercial real estate (“CRE”) |  |  |  |
Loans Receivable and Allowance for Credit Losses |  |  |  |
Loans transferred from held-for-investment to held-for-sale | 0 | 14,969,000 | 7,250,000 | 31,624,000
Sales | 0 | 14,969,000 | 7,250,000 | 31,624,000
Purchases | 0 | 0 | 0 | 0
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses | 1,414,000 | 1,021,000 | 2,688,000 | 1,021,000
Commercial lending | Real estate loan | Multifamily residential |  |  |  |
Loans Receivable and Allowance for Credit Losses |  |  |  |
Loans transferred from held-for-investment to held-for-sale | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Purchases | 838,000 | 1,350,000 | 2,358,000 | 7,302,000
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses | 0 | 0 | 0 | 0
Commercial lending | Construction and land |  |  |  |
Loans Receivable and Allowance for Credit Losses |  |  |  |
Loans transferred from held-for-investment to held-for-sale | 0 | 0 | 0 | 1,573,000
Sales | 0 | 0 | 0 | 1,573,000
Purchases | 0 | 0 | 0 | 0
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses | 0 | 0 | 0 | 0
Consumer lending | Real estate loan | Single-family residential |  |  |  |
Loans Receivable and Allowance for Credit Losses |  |  |  |
Loans transferred from held-for-investment to held-for-sale | 0 | 0 | 0 | 0
Sales | 31,847,000 | 2,708,000 | 50,197,000 | 6,322,000
Purchases | 17,294,000 | 29,568,000 | 18,378,000 | 83,607,000
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses | $ 0 | $ 11,000 | $ 0 | $ 11,000

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