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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