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Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | $ 41,693,781 | $ 38,390,955
Allowance for loan losses | (541,579) | (619,983)
Loans held-for-investment, net | 41,152,202 | 37,770,972
Deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts | (50,700) | (58,800)
CARES Act, Paycheck Protection Program |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Net origination fees | (5,700) | (12,700)
C&I | CARES Act, Paycheck Protection Program |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 534,200 | 1,570,000
Commercial Lending |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 30,327,746 | 28,440,027
Commercial Lending | C&I |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 14,150,608 | 13,631,726
Commercial Lending | CRE |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 12,155,047 | 11,174,611
Commercial Lending | Residential loan | Multifamily |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 3,675,605 | 3,033,998
Commercial Lending | Construction and land |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 346,486 | 599,692
Commercial Lending | Total CRE |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 16,177,138 | 14,808,301
Consumer Lending |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 11,366,035 | 9,950,928
Consumer Lending | Residential loan | Single-family |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 9,093,702 | 8,185,953
Consumer Lending | HELOCs |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 2,144,821 | 1,601,716
Consumer Lending | Total residential mortgage |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | 11,238,523 | 9,787,669
Consumer Lending | Other consumer |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans held-for-investment | $ 127,512 | $ 163,259

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