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Loans Receivable and Allowance for Credit Losses (Loans Purchases, Sales and Transfers) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Loans transferred from held-for-investment to held-for-sale | $ 599,610 | $ 329,069 | $ 285,637
Sales | 621,543 | 412,221 | 296,836
Purchases | 1,044,711 | 389,580 | 523,830
Write-downs to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale | 12,200 | 2,800 | 789
Net gains on sales of loans | 8,909 | 4,501 | 4,035
C&I | Loans receivable, originated |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Sales | 413,100 | 400,400 | 230,300
Loans Sold in Secondary Market | Loans receivable, purchased |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Sales | 208,400 | 11,800 | 66,500
Commercial Lending | C&I |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Loans transferred from held-for-investment to held-for-sale | 496,655 | 300,677 | 245,002
Sales | 502,694 | 303,520 | 245,791
Purchases | 479,690 | 154,154 | 397,615
Commercial Lending | CRE |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Loans transferred from held-for-investment to held-for-sale | 78,834 | 26,994 | 39,062
Sales | 78,834 | 26,994 | 39,062
Purchases | 0 | 0 | 0
Commercial Lending | Residential loan | Multifamily |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Loans transferred from held-for-investment to held-for-sale | 0 | 1,398 | 0
Sales | 0 | 1,398 | 0
Purchases | 370 | 2,358 | 8,988
Commercial Lending | Construction and land |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Loans transferred from held-for-investment to held-for-sale | 18,883 | 0 | 1,573
Sales | 21,557 | 0 | 1,573
Purchases | 0 | 0 | 0
Consumer Lending | Residential loan | Single-family |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |
Loans transferred from held-for-investment to held-for-sale | 5,238 | 0 | 0
Sales | 18,458 | 80,309 | 10,410
Purchases | $ 564,651 | $ 233,068 | $ 117,227

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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